Add topics.bulk french translation

First proposition, I hope doing it correctly :)

Fix extra space
Merge pull request #1980 from Onaldanm/patch-fr-bulk

Add topics.bulk french translation
Preserve spoiler tags in post excerpts.
Merge pull request #1981 from vikhyat/spoilers

Preserve spoiler tags in post excerpts
BUGFIX: rename site_settings in the database too
BUGFIX: Do not allow `font` tags.
Adds tests for PostsController#replies.