Create translation.json

Added a german translation
Fix some french translations
Merge pull request #90 from faitnoise/master

Create translation.json
Merge pull request #91 from bricewge/patch-1

Fix some french translations
First translation in Greek. Some phrases are lenghty though. Not sure
if they will look good.
Update german translation
Fix gittip image in Tips paragraph
Merge pull request #93 from atmosx/master

First Greek translation
Merge pull request #94 from pc-fan/master

Update german translation
Merge pull request #96 from pc-fan/readme_fix

Fix gittip image in the README Tips paragraph
Make notebooks sortable by name or when they were created.
Sort tags by default alphabetically.
Sort notebooks in 'add' and 'edit' forms.
Added labels for sorting of notebooks on forms etc.
Update translation.json

Added the new languages
Merge pull request #111 from faitnoise/patch-1

Update translation.json
Merge pull request #108 from brian-heumann/sort-notebooks-tags

Sort notebooks & tags
Merge remote changes
User can add his own Dropbox API key #102
Ability to set up own Dropbox API key + bug fix #102