Merge pull request #20391 from 6a68/bug-1021428-fmd-offline-error

Bug 1021428 - Show error when FMD button is clicked without network connection
Merge pull request #20012 from julienw/1015867-max-height-composer

Bug 1015867 - [Messages] The editable composer should take more space r=...
Merge pull request #20441 from stasm/1015255-bamba

Bug 1015255 - Don't leak other localizations during buildtime optimization. r=gandalf
Merge pull request #20349 from stasm/1022445-matching-numbers

Bug 1022445 - Matching numbers screen results is not properly localized. r=etienne r=gandalf