[Configure] Disable unmaintained unusable huge extension

The Configure extension l10n has multiple issues and nobody working on them: bug 52224.
It's also a very huge set of messages which are not even in real use (bug 43380),
so the current status discourages actual work on the source text and translations both
in the extension and elsewhere.

Change-Id: I8df6146ec54dfae760abb4f97ab1269cb24612e4