tpl/lang: Add new localized versions of lang.FormatNumber etc.

Fixes #8820

docs/layouts/template-func/page.html

@@ -0,0 +1,54 @@
+{{ $pkg := .Params.package}}
+{{ $funcs := index site.Data.docs.tpl.funcs $pkg }}
+
+{{  range $k, $v := $funcs }}
+  {{ if $v.Description }}
+    {{ $func := printf "%s.%s" $pkg $k }}
+    <h2>
+      <a class="header-link" href="#{{ $func | anchorize | safeURL }}">
+        <svg class="fill-current o-60 hover-accent-color-light" height="22px" viewBox="0 0 24 24" width="22px" xmlns="http://www.w3.org/2000/svg">
+          <path d="M0 0h24v24H0z" fill="none"/>
+          <path d="M3.9 12c0-1.71 1.39-3.1 3.1-3.1h4V7H7c-2.76 0-5 2.24-5 5s2.24 5 5 5h4v-1.9H7c-1.71 0-3.1-1.39-3.1-3.1zM8 13h8v-2H8v2zm9-6h-4v1.9h4c1.71 0 3.1 1.39 3.1 3.1s-1.39 3.1-3.1 3.1h-4V17h4c2.76 0 5-2.24 5-5s-2.24-5-5-5z"/>
+        </svg>
+      </a>
+      {{ $func }}
+    </h2>
+    {{ with  $v.Description }}
+      <p class="f4 lh-copy">
+        {{ . |  $.RenderString | safeHTML }}
+      </p>
+    {{ end }}
+    <h4 class="minor mb3 pt2 primary-color-dark">
+      Syntax
+    </h4>
+    <div class="f5 mb4 ph3 pv2 bg-light-gray" style="border-left:4px solid #0594CB;">
+      {{ $pkg }}.{{ $k }}
+      {{ with $v.Args }}
+        <span class="ttu">
+          {{ delimit $v.Args ", "}}
+        </span>
+      {{ end }}
+      <span></span>
+    </div>
+    {{ if $v.Examples }}
+      <h4 class="minor mb3 pt2 primary-color-dark">
+        Examples
+      </h4>
+    {{ end }}
+    {{ range $v.Examples }}
+      {{ $input := index . 0 }}
+      {{ $result := index . 1 }}
+      {{ $example := printf "%s ---> %s" $input $result }}
+
+      {{ highlight $example "go-html-template" "" }}
+    {{ end }}
+    {{ with $v.Aliases }}
+      <h4 class="minor mb3 pt2 primary-color-dark">
+        Aliases
+      </h4>
+      <p>
+        {{ delimit . ", "}}
+      </p>
+    {{ end }}
+  {{ end }}
+{{ end }}