German translation worked over

- Found several french leftovers here & there, replaced them with valid
german ones.
- Fixed typos.
- Certain words like "Neuste" are slang at best and do not belong here.
Remove some debug leftovers
Merge pull request #439 from doertedev/master

German tranlsations worked over
Merge pull request #440 from magabriel/fix-debug-leftovers

Remove some debug leftovers
Some Spanish translations
Merge pull request #441 from magabriel/fix-spanish-messages

Some Spanish translations
Some changes to paths for inserting images when Bolt is in a subfolder. See #433.
Some more changes to the logic of outputting headers in overview.twig. Hopefully this does the trick.
Updating composer.lock.
Bumping version number to "1.1 RC"
Added two try/catch blocks, so we don't break on setup when bolt_authtoken is not yet present.