Align with Evernote CSS styles

This commits removes several differences between our styles. The day chosen to
diff against the Evernote styles is 23 September 2013.

This will reduce conflicts when picking subsequent commits from Evernote, and
also will remove some glitches in our UI that appeared with the last UI
changes we picked from Evernote.

Some minor bugs in display were introduced, namely the vertical missalignment
of the language picker from the top bar.
templates: Get rid of breadcrumb caching

This is causing issues in tests and wouldn't work anyway. CACHE_TIMEOUT
does not actually exist and should it, the performance improvement would
be insignificant.
templates: Get rid of legalpage caching

See ba3e607
templates: Use infinite caching for unit editing
tests: Add a dummy SECRET_KEY for tests
tests: Fix broken logic in views tests