Use fireplace-specific endpoint for collections (bug 989331)

This endpoint was added in mozilla/zamboni@f780902
no longer living in the ghetto (bug 990337)
fix missing content descriptors (bug 981100)
fix descriptors for icons too
(Losslessly) Optimize our PNGs (bug 993678)
Merge pull request #435 from diox/optimize-pngs

(Losslessly) Optimize our PNGs (bug 993678)
update for legal docs
clean up font-face rules to work around Firefox OS platform bug (bug 991419)
Resize carriers logos down to more reasonable dimensions (bug 988473)
L10n Extract/compile script. Today's lucky number is 8866.
Update Japanese (ja) l10n
update email address
Merge pull request #438 from kyoshino/locale-ja

Update Japanese (ja) l10n
Commit from Mozilla Verbatim by user michael.koehler1@gmx.de.: 293 of 293 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user ouesten.: 293 of 293 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user Mikk.: 293 of 293 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user markh@babelzilla.org.: 293 of 293 strings translated (0 fuzzy).
Merge pull request #433 from spasovski/nukeghetto

This hasn't been doing much for the last while since the selector hasn't been valid for a while so should be safe to merge.
Commit from Mozilla Verbatim by user gialloporpora.: 293 of 293 strings translated (0 fuzzy).
Merge pull request #437 from diox/carriers-logos-are-huge

Resize carriers logos down to more reasonable dimensions (bug 988473)