Merge pull request #11027 from huchengtw-moz/system/bug_888821_ua_profile_configuration_based_on_mcc_mnc

Bug 888821 - B2G MMS: UA profile configuration based on MNC and MCC. r=archurcc(cherry picked from commit 4ec7c428f6a63a44f888ea6f6ade0385c89ae305)

Conflicts:
	apps/system/js/operator_variant/operator_variant.js
Revert "Merge pull request #10983 from gaye/bug-889396"

This reverts commit d19a13c8a54411bba0a80c6a23d1b6cda9deb93f.
Merge remote-tracking branch 'huchengtw-moz/system/Bug_888821-v1-train' into v1-train
Merge pull request #11052 from ian-liu/email/Bug891641_Browser_links_in_received_emails_are_unselectable_if_file_attachments_are_present

Bug 891641 - [B2G] [Leo] [Email] Browser links in received emails are unselectable if file attachments are present, r=@asutherland (cherry picked from commit afde38e7be5455d5d634c58a60a4d8009e0e7034)