diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index 1bc73e8..1b0deab 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -409,7 +409,7 @@ const LocaleRoute: FC = () => {
       void i18n.changeLanguage (activeLocale)
   }, [activeLocale, i18n])
 
-  const redirect = legacyLocalePath (location)
+  const redirect = legacyLocalePath (location, pathname => resolvePageRoute (pathname) != null)
   if (!(isLocaleCode (locale)) && redirect == null)
     return <NotFound/>
   if (isError && data == null)
diff --git a/frontend/src/components/counts/CountsAdditionalConditions.tsx b/frontend/src/components/counts/CountsAdditionalConditions.tsx
index 61f2487..9f58347 100644
--- a/frontend/src/components/counts/CountsAdditionalConditions.tsx
+++ b/frontend/src/components/counts/CountsAdditionalConditions.tsx
@@ -1,4 +1,4 @@
-import { useState } from 'react'
+import { useEffect, useState } from 'react'
 
 import DateTimeField from '@/components/common/DateTimeField'
 import { Button } from '@/components/ui/button'
@@ -9,18 +9,25 @@ import useDialogue from '@/lib/dialogues/useDialogue'
 import { inputClass } from '@/lib/utils'
 import { useUITranslation } from '@/lib/useUITranslation'
 
+import type { DialogueFormControls } from '@/lib/dialogues/useDialogue'
 import type { CountsCondition, CountsDefinition } from '@/lib/countsDefinitions'
 
 
-const ConditionEditor = ({ definition, initial, save }: {
-    definition: CountsDefinition; initial?: CountsCondition
-    save: (condition: CountsCondition) => void },
+const ConditionEditor = (
+    { definition, initial, controls, save }: {
+	definition: CountsDefinition; initial?: CountsCondition
+	controls: DialogueFormControls
+	save: (condition: CountsCondition) => void },
 ) => {
   const { label, message } = useUITranslation ('counts')
   const fields = countsFilterFields (definition)
   const [field, setField] = useState (initial?.field ?? 'resource_id')
   const [operator, setOperator] = useState (initial?.operator ?? 'eq')
   const operators = definition.fields.find (item => item.key === field)?.operators ?? []
+  useEffect (() => {
+    controls.setActions ([{ label: label (initial == null ? 'add' : 'shared:actions.edit'),
+	onSelect: () => save ({ ...initial, field, operator }) }])
+  }, [controls, field, operator, initial, label, save])
   return <div className="space-y-2">
     <select value={field} aria-label={message ('field').text} className={inputClass ()}
         onChange={event => { setField (event.target.value); setOperator ('eq') }}>
@@ -32,8 +39,6 @@ const ConditionEditor = ({ definition, initial, save }: {
       {operators.map (key => <option key={key} value={key}>
         {message (`operators.${key}`).text}</option>)}
     </select>
-    <Button type="button" onClick={() => save ({ ...initial, field, operator })}>
-      {label (initial == null ? 'add' : 'shared:actions.edit')}</Button>
   </div>
 }
 
@@ -48,14 +53,14 @@ const CountsAdditionalConditions = ({ params, update }: {
   const conditions = readCountsJSON<CountsCondition[]> (params, 'conditions', [])
   const write = (next: CountsCondition[]) => update ('conditions', JSON.stringify (next))
   const edit = (index?: number) => {
-    void dialogue.form ({ title: label ('additionalConditions'), body: controls => (
-	<ConditionEditor definition={definition}
-	    initial={index == null ? undefined : conditions[index]}
-            save={condition => {
-              write (index == null ? [...conditions, condition]
-                  : conditions.map ((item, position) => position === index ? condition : item))
-              controls.close ()
-            }}/>) })
+    const initial = index == null ? undefined : conditions[index]
+    const save = (condition: CountsCondition) => {
+      write (index == null ? [...conditions, condition]
+          : conditions.map ((item, position) => position === index ? condition : item))
+    }
+    dialogue.form ({ title: label ('additionalConditions'), footerLayout: 'inline',
+        body: controls => <ConditionEditor definition={definition}
+            initial={initial} controls={controls} save={save}/> })
   }
   const patch = (index: number, change: Partial<CountsCondition>) => write (
       conditions.map ((item, position) => position === index ? { ...item, ...change } : item))
diff --git a/frontend/src/components/counts/CountsControls.tsx b/frontend/src/components/counts/CountsControls.tsx
index f9b95a7..b9bc956 100644
--- a/frontend/src/components/counts/CountsControls.tsx
+++ b/frontend/src/components/counts/CountsControls.tsx
@@ -9,7 +9,9 @@ import FormField from '@/components/common/FormField'
 import HelpPopover from '@/components/common/HelpPopover'
 import TagInput from '@/components/common/TagInput'
 import { Button } from '@/components/ui/button'
-import { countsUseLatest, normaliseCountsParams } from '@/lib/counts'
+import { countsUseLatest, fieldsForCounts, normaliseCountsParams,
+	 selectedCountColumns } from '@/lib/counts'
+import { useCountsDefinition } from '@/lib/countsDefinitions'
 import { useClientMotion } from '@/lib/useClientMotion'
 import { inputClass } from '@/lib/utils'
 import { useUITranslation } from '@/lib/useUITranslation'
@@ -21,21 +23,36 @@ import type { CountsResource } from '@/lib/counts'
 
 const CountsControls = (
     { resource, applied, open, setOpen, execute, displayJSON, displayRowNumbers,
-      reorder, actions }: {
+      displayThumbnail, reorder, actions }: {
         resource: CountsResource; applied: URLSearchParams; open: boolean
         setOpen: (open: boolean) => void
         execute: (params: URLSearchParams) => void
         displayJSON: (enabled: boolean) => void
 	displayRowNumbers: (enabled: boolean) => void
+	displayThumbnail: (enabled: boolean) => void
         reorder: (value: string) => void; actions?: ReactNode },
 ) => {
   const { label, message } = useUITranslation ('counts')
+  const definition = useCountsDefinition ()
   const id = useId ()
   const motion = useClientMotion ()
   const [draft, setDraft] = useState (() => new URLSearchParams (applied))
   const order = applied.get ('order')
   const nestedJSON = applied.get ('nested_json')
   const rowNumbers = applied.get ('row_numbers')
+  const thumbnail = selectedCountColumns (resource, applied, definition).includes ('thumbnail')
+  const details = applied.get ('mode') === 'details'
+  const hasNested = details && fieldsForCounts (resource, definition)
+      .some (field => field.children != null)
+  useEffect (() => {
+    setDraft (previous => {
+      const next = new URLSearchParams (previous)
+      const columns = selectedCountColumns (resource, previous, definition)
+	  .filter (column => column !== 'thumbnail')
+      next.set ('columns', (thumbnail ? ['thumbnail', ...columns] : columns).join (','))
+      return next
+    })
+  }, [thumbnail, resource, definition])
   useEffect (() => {
     setDraft (previous => {
       const next = new URLSearchParams (previous)
@@ -95,14 +112,32 @@ const CountsControls = (
         {['summary', 'details'].map (value => <option key={value} value={value}>
           {message (value).text}</option>)}
       </select>
+      {actions}
+    </div>
+    <fieldset className="flex flex-wrap items-center gap-x-3 gap-y-1 border-b py-1
+	dark:border-slate-700">
+      <legend className="sr-only">{label ('displaySettings')}</legend>
       <label className="inline-flex items-center gap-1 text-sm">
 	<input type="checkbox" checked={draft.get ('row_numbers') === '1'}
 	    onChange={event => {
 	      update ('row_numbers', event.target.checked ? '1' : '0')
 	      displayRowNumbers (event.target.checked)
 	    }}/>{label ('rowNumbers')}
-      </label>{actions}
-    </div>
+      </label>
+      {details && resource === 'posts' && <label
+	  className="inline-flex items-center gap-1 text-sm">
+	<input type="checkbox" checked={thumbnail}
+	    onChange={event => displayThumbnail (event.target.checked)}/>
+	{label ('columns.thumbnailDisplay')}
+      </label>}
+      {hasNested && <label className="inline-flex items-center gap-1 text-sm">
+	<input type="checkbox" checked={draft.get ('nested_json') === '1'}
+	    onChange={event => {
+	      update ('nested_json', event.target.checked ? '1' : '0')
+	      displayJSON (event.target.checked)
+	    }}/>{label ('nested.asJSON')}
+      </label>}
+    </fieldset>
     <AnimatedCollapse id={id} open={open}>
     <div className="max-h-[35dvh] overflow-y-auto overscroll-contain
         border-b py-2 dark:border-slate-700 md:max-h-[40dvh]">
@@ -111,12 +146,6 @@ const CountsControls = (
 	  {mode === 'summary' ? <CountsAxes params={draft} update={update}/>
               : <>
                 <legend className="mb-1 font-semibold">{label ('output')}</legend>
-                <label className="mb-1 flex items-center gap-1">
-                  <input type="checkbox" checked={draft.get ('nested_json') === '1'}
-                      onChange={event => {
-                        update ('nested_json', event.target.checked ? '1' : '0')
-                        displayJSON (event.target.checked)
-                      }}/>{label ('nested.asJSON')}</label>
                 <CountsFieldTree resource={resource} params={draft} update={(key, value) => {
                   update (key, value)
                   if (key === 'order') reorder (value)
diff --git a/frontend/src/components/counts/CountsFieldTree.tsx b/frontend/src/components/counts/CountsFieldTree.tsx
index f8fcd26..90151d6 100644
--- a/frontend/src/components/counts/CountsFieldTree.tsx
+++ b/frontend/src/components/counts/CountsFieldTree.tsx
@@ -109,9 +109,11 @@ const CountsFieldTree = (
     update ('children', countChildPaths (fields).filter (
 	key => key.includes ('.') && selected.has (key)).join (','))
   }
+  const visibleFields = parent === ''
+      ? fields.filter (field => field.key !== 'thumbnail') : fields
   return (
       <>
-	<FieldGroup fields={fields} path={parent} params={params} enabled selected={selected}
+	<FieldGroup fields={visibleFields} path={parent} params={params} enabled selected={selected}
 	    select={select} update={update}/>
       </>)
 }
diff --git a/frontend/src/components/counts/CountsResults.tsx b/frontend/src/components/counts/CountsResults.tsx
index c1ed84c..c60112b 100644
--- a/frontend/src/components/counts/CountsResults.tsx
+++ b/frontend/src/components/counts/CountsResults.tsx
@@ -50,14 +50,19 @@ const CountsResults = (
     switch (column)
     {
     case 'resource_id':
-      if (resource === 'nico_tags') return <PrefetchLink to="/nico/tags">
-        {row.resourceId}</PrefetchLink>
+      if (resource === 'nico_tags') return row.name ? (
+	  <PrefetchLink to={`/tags/nico?${new URLSearchParams ({ name: row.name })}`}>
+	    {row.resourceId}</PrefetchLink>) : row.resourceId
       if (resource === 'tag_groups') return <PrefetchLink
           to={`/wiki/${encodeURIComponent (`タググループ:${row.name ?? ''}`)}`}>
         {row.resourceId}</PrefetchLink>
       return <PrefetchLink to={`/${resource === 'tag_descriptions' ? 'tags' : resource}/${
           encodeURIComponent (row.resourceId)}`}>
 	{row.resourceId}</PrefetchLink>
+    case 'name':
+      return resource === 'nico_tags' && row.name ? (
+	  <PrefetchLink to={`/tags/nico?${new URLSearchParams ({ name: row.name })}`}>
+	    {value}</PrefetchLink>) : value
     case 'thumbnail':
       {
 	const url = countsImageURL (row.thumbnailBase)
diff --git a/frontend/src/components/counts/CountsSortHeader.tsx b/frontend/src/components/counts/CountsSortHeader.tsx
index d14b5e8..f19a7bf 100644
--- a/frontend/src/components/counts/CountsSortHeader.tsx
+++ b/frontend/src/components/counts/CountsSortHeader.tsx
@@ -87,7 +87,7 @@ const CountsSortHeader = (
 	    }}>
 	  <span className="truncate" lang={label.language}>{label.text}</span>
 	  {priority >= 0 && <span aria-hidden>
-	    {direction === 'asc' ? '↑' : '↓'}{sorts.length > 1 && priority + 1}</span>}
+	    {direction === 'asc' ? '▲' : '▼'}{sorts.length > 1 && priority + 1}</span>}
 	</Button>
 	<CountsResizeHandle field={field} label={label}/>
       </th>)
diff --git a/frontend/src/components/dialogues/DialogueProvider.tsx b/frontend/src/components/dialogues/DialogueProvider.tsx
index d9185a5..e277f41 100644
--- a/frontend/src/components/dialogues/DialogueProvider.tsx
+++ b/frontend/src/components/dialogues/DialogueProvider.tsx
@@ -237,7 +237,10 @@ const DialogueProvider: FC<Props> = ({ children }) => {
 			       </Button>))}
 			 </div>
 
-			 <div className="flex w-full flex-col gap-2 md:w-auto md:flex-row">
+			 <div className={cn (
+			     'flex w-full gap-2 md:w-auto md:flex-row',
+			     active.options.footerLayout === 'inline'
+			     ? 'flex-row justify-end [&>button]:w-auto' : 'flex-col')}>
 			   <Button
 			       className="w-full md:w-auto"
 			       variant="outline"
diff --git a/frontend/src/entry-server.tsx b/frontend/src/entry-server.tsx
index 3336c76..ecbb831 100644
--- a/frontend/src/entry-server.tsx
+++ b/frontend/src/entry-server.tsx
@@ -66,7 +66,9 @@ export const render = async (
     authentication: Pick<RenderContext, 'cookie' | 'forwardedFor'> = { },
 ): Promise<RenderedPage | RouteResponse> => {
   const url = new URL (address, origin)
-  const legacy = legacyLocalePath ({ pathname: url.pathname, search: url.search, hash: '' })
+  const legacy = legacyLocalePath (
+      { pathname: url.pathname, search: url.search, hash: url.hash },
+      pathname => resolvePageRoute (pathname) != null)
   const pathname = legacy == null ? url.pathname : new URL (legacy, origin).pathname
   const segment = pathname.split ('/')[1]
   const known = resolvePageRoute (pathname)
diff --git a/frontend/src/lib/dialogues/useDialogue.ts b/frontend/src/lib/dialogues/useDialogue.ts
index b9774a2..b9343f1 100644
--- a/frontend/src/lib/dialogues/useDialogue.ts
+++ b/frontend/src/lib/dialogues/useDialogue.ts
@@ -41,6 +41,7 @@ type DialogueFormOptions = { title:         ReactNode
 			     description?:  ReactNode
 			     body:          (controls: DialogueFormControls) => ReactNode
 			     cancelText?:   ReactNode
+			     footerLayout?: 'inline'
 			     size?:         'default' | 'large' | 'viewport' }
 
 type DialogueAPI =
diff --git a/frontend/src/lib/locales.ts b/frontend/src/lib/locales.ts
index a3820d7..bf1b418 100644
--- a/frontend/src/lib/locales.ts
+++ b/frontend/src/lib/locales.ts
@@ -17,11 +17,6 @@ export const fetchLocales = (): Promise<{ locales: AvailableLocale[] }> =>
 export const LOCALE_LABELS: Record<LocaleCode, string> = {
     ja: '日本語', 'ain-Kana': 'ヤウンモシルン アイヌ イタㇰ' }
 
-const LEGACY_ROOTS = [
-    'posts', 'tags', 'nico', 'theatres', 'materials', 'wiki', 'help',
-    'users', 'settings', 'tos', 'gekanator', 'more']
-
-
 export const isLocaleCode = (value: unknown): value is LocaleCode =>
     SUPPORTED_LOCALES.some (locale => locale === value)
 
@@ -73,11 +68,15 @@ export const switchLocalePath = (
     `/${ locale }${ unlocalisedPath (location.pathname) }${ location.search }${ location.hash }`
 
 
+// Keep automatic selection independent of the page and API route trees.
+export const automaticallySelectedLocale = (): LocaleCode => 'ja'
+
+
 export const legacyLocalePath = (
     location: { pathname: string; search: string; hash: string },
+    isPage: (pathname: string) => boolean = () => false,
 ): string | null => {
-  const root = location.pathname.split ('/')[1]
-  return (location.pathname === '/' || LEGACY_ROOTS.includes (root))
-      ? `/ja${ location.pathname }${ location.search }${ location.hash }`
-      : null
+  if (localeFromPath (location.pathname) != null || !isPage (location.pathname))
+    return null
+  return switchLocalePath (location, automaticallySelectedLocale ())
 }
diff --git a/frontend/src/locales/ja/counts.json b/frontend/src/locales/ja/counts.json
index 74a6ae7..28e4e08 100644
--- a/frontend/src/locales/ja/counts.json
+++ b/frontend/src/locales/ja/counts.json
@@ -13,6 +13,7 @@
   "output": "出力項目",
   "filters": "抽出条件",
   "mode": "表示",
+  "displaySettings": "表示設定",
   "summary": "集計",
   "details": "明細",
   "axis": "集計軸",
@@ -41,7 +42,7 @@
     "kind": "内部・外部",
     "sections": "記載区間",
     "names": "言語別名称",
-    "thumbnailDisplay": "サムネール表示"
+    "thumbnailDisplay": "$t(shared:labels.thumbnail)"
   },
   "fields": {
     "from": "開始（端末の時刻帯・以上）",
diff --git a/frontend/src/pages/CountsResourcePage.tsx b/frontend/src/pages/CountsResourcePage.tsx
index ec1c343..ee337b4 100644
--- a/frontend/src/pages/CountsResourcePage.tsx
+++ b/frontend/src/pages/CountsResourcePage.tsx
@@ -41,6 +41,8 @@ const CountsResourceContent = ({ resource }: { resource: CountsResource }) => {
   controlParams.delete ('nested_json')
   controlParams.delete ('order')
   controlParams.delete ('row_numbers')
+  controlParams.set ('columns', selectedCountColumns (resource, params, definition)
+      .filter (column => column !== 'thumbnail').join (','))
   const request = countsRequestParams (params)
   const [open, setOpen] = useState (false)
   const [sidebarOpen, setSidebarOpen] = useState (false)
@@ -195,6 +197,11 @@ const CountsResourceContent = ({ resource }: { resource: CountsResource }) => {
 		  reorder={value => update ('order', value)}
 		  displayJSON={enabled => update ('nested_json', enabled ? '1' : '0')}
 		  displayRowNumbers={enabled => update ('row_numbers', enabled ? '1' : '0')}
+		  displayThumbnail={enabled => {
+		    const columns = selectedCountColumns (resource, params, definition)
+			.filter (column => column !== 'thumbnail')
+		    update ('columns', (enabled ? ['thumbnail', ...columns] : columns).join (','))
+		  }}
 		  execute={next => {
 		    if (next.toString () === canonical) void refetch ()
 		    else setParams (next)