l10n: Updating french locale
update seahorse operator shelf logo (bug 851722)
show featured apps even if fewer than 3 (bug 896741)
Tests update
disable packaged apps on desktop for < Firefox 25 (bug 907203)
Merge pull request #240 from cvan/pack25

disable packaged apps when unsupported (bug 907203)
Merge pull request #237 from lissyx/locale.fr

l10n: Updating french locale
update pl locale for https://github.com/mozilla/fireplace/pull/239
update el for https://github.com/mozilla/fireplace/pull/238
update sr sr_Latn for https://github.com/mozilla/fireplace/pull/235
Update messages.po for the bg locale
Merge pull request #241 from chilyashev/patch-2

Update messages.po for the bg locale
promote marketplace app when opening in browser (bug 780720)