Move toTokenStrings to state
Add target strings in comment header section

That way they are a little readable outside of Arethusa.
Make reverseIndex of comments public
Add a starting value for reverseIndex
Show count of commented in commentFilter

And make it clickable to highlight or select them, similar to
unusedTokenHighlighter
Add focusMe directive to core
Add key binding to write a new comment
Merge pull request #308 from latin-language-toolkit/comments

Comments plugin
Add translator service

Wraps angular-translate. Closes #305. Actually a nice API.
Translate complete comments plugin to German
Activate angular-translate once and for all
Add flags for translateLanguage button
Minor translation change
Allow a callback fn in translator
Start to exchange translate filter with translator
Fix unusedTokenHighlighter translations
Lots of translations I
Translate saver
Translate history plugin
Translate MainCtrl