Disable custom /firefox/whatsnew view for pl. Bug 936269.

- Keeping functionality & template around for future use.
[Fix Bug 723267] Add new projects/calendar page
Bug 948022 - update homepage and base.py to use l10n tags for promos
Bug 906943: Update transbar string to avoid substitution.

Many (most) localizers prefer to include their language name
in their translation for gramatical and style reasons.
Merge pull request #1515 from pmclanahan/update-transbar-string-906943

Bug 906943: Update transbar string to avoid substitution.
Merge pull request #1491 from jpetto/bug-936269-disable-custom-whatsnew-for-pl

Disable custom /firefox/whatsnew view for pl. Bug 936269.
Merge pull request #1506 from pascalchevrel/Bug-948022_template_changes_to_use_l10n_tags

Bug 948022 - update homepage and base.py to use l10n tags for promos
Fix bug 943434 - update home page mobilizer link for Hungary
Merge pull request #1466 from Sancus/calendar

[Fix Bug 723267] Add new projects/calendar page
Merge pull request #1518 from craigcook/bug-943434-update-hungary-mobilizer-link

Fix bug 943434 - update home page mobilizer link for Hungary