Add firefox/developer.lang to all locales

Not critical for now, no deadline
Merge pull request #217 from flodolo/dev_edition

Add firefox/developer.lang to all locales
Update deadlines for channel and desktop/trust
Merge pull request #218 from flodolo/update_deadlines

Update deadlines for channel and desktop/trust
Move $mozillaorg to locales.inc.php, add back nn-NO

* No point in having $mozillaorg in an untracked file like
settings.inc.php, moved it to locales.inc.php
* Add back nn-NO: we need it for download page (firefox/new.lang), no
point in tracking only some files.
Merge pull request #219 from flodolo/fix_nnNO

Move $mozillaorg to locales.inc.php, add back nn-NO
Clean up locales.inc.php
Merge pull request #220 from flodolo/fix_locales

Clean up locales.inc.php
Add Russian to screenshots.lang (1.3)
Merge pull request #221 from flodolo/russian_1_3

Add Russian to screenshots.lang (1.3)
Add snippets for december
Merge pull request #222 from flodolo/snippets_dec

Add snippets for december
Add bg to Pootle locales
Merge pull request #223 from flodolo/bg_pootle

Add bg to Pootle locales
Add gd to a few pages already localized on Pootle
Merge pull request #224 from flodolo/add_pages_pootle

Add gd to a few pages already localized on Pootle