Changes
Implement sandbox per talk page request and and testcases.
{{#invoke:Namespace detect|main|file='''English:''' {{{1}}}|other=<strong class="error">Transclusion error: {{tl|En}} is only for use in File namespace. Use {{tl|lang-en}} or {{tl|en icon}} instead.</strong>|demospace={{{demospace|<noinclude>File</noinclude>}}}}}<noinclude>
{{documentation}}
</noinclude>
{{documentation}}
</noinclude>