Enable 15 years template for new locales (cs bug 868966, it bug 884248, ms bug 885975)

cs: Bug 868966
Added email address and localized banner, inserted in
LOCALES_WITH_MOZ15.

it: Bug 884248
Added email address and localized banner, inserted in
LOCALES_WITH_MOZ15. CSS fix for slide 10.

ms: Bug 885975
Added email address, inserted in LOCALES_WITH_MOZ15, they're using the
same banner currently used by "id" (so no new image, just css rule).

ta:
Fixed wrong bottom padding for slide 10 (total top+bottom 46px instead
of 56px. the background is slightly cut).
Bug 880182 - /ja-JP-mac/ should be redirected to /ja/

Removed (?:-mac)? as it's no longer needed
Merge pull request #998 from flodolo/newlocales
Bug 874982: All buttons should offer stub for enabled builds.
Merge pull request #952 from pmclanahan/stub-for-release-bug-874982