Allow the word "bridges" to be translated.
Change "fte" → "fteproxy" and remove "TBB" in do-not-translate list.
Place "TRANSLATORS" comments directly above the string they refer to.

Apparently, Transifex only displays comments which are for the string
being translated, and only one string is viewed at a time. Sigh.

 * THANKS to Phoul on IRC for pointing out the issue with how Transifex
   handles TRANSLATOR comments.
Update translation template file.