Don't send a notification for a Subscription which does not link to a user

Fixes #375
Missing keys from 'es' locale
Dependencies update
Don't send a notification for a Subscription which does not link to a user

Fixes #375
Translate all the forums!!! [es]

Fixes #378
Fix spelling and common uses
Remove a negation in the italian translation
Add Traditional Chinese translation and update Simplified Chinese translation
Merge pull request #383 from ascendbruce/master

Chinese translation (Traditional and Simplified)
Redo italian translation

Now it contains all the strings of the english version.
Merge pull request #385 from fracek/italian_translation

Redo italian translation
Add OrbsCCG to list of sites