Bug 914454 - Add a new keyboard layout, "Greek SMS" to allow sending
messages with GSM 7-bit encoding.
Merge pull request #12518 from RudyLu/keyboard/greek_sms

Bug 914454 - Add a new keyboard layout, "Greek SMS" to allow sending. r=djf
Bug 914454 - Ensure SMS messages in only uppercase Greek letters are sent with 7bit encoding on the carrier partner network r=rwaldron

Set x-inputmode=-moz-sms-7bit for SMS only
(cherry picked from commit 4e14ffad41827a6aa10f3d62d3a8831ea626c738)

Conflicts:
	apps/sms/js/compose.js
Merge branch 'v1-train' into v1.1.0hd