Add missing i18n for a word in the legend

The "Transclude" word in the Special:Interwiki legend was
passed verbatim, i.e. not translated. Fixed by wrapping in
{{int:}} just like the rest.

Change-Id: Iaf55857530d4200eb2e179ce9a15121a1d371c90
Merge "Add missing i18n for a word in the legend"