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Merge branch 'master' of github.com:mozilla/fireplace
Commit from Mozilla Verbatim by user sektormaster@atlas.sk.: 309 of 318 strings translated (0 fuzzy).
Commit from Mozilla Verbatim by user sektormaster@atlas.sk.: 316 of 318 strings translated (0 fuzzy).
Firefox Accounts migration banner (bug 1052864)

Introducing Custom Elements!
Close #657
Implement device filtering UI (bug 969244)
Add translations
Replace old device override hack
Add unit tests, clarify a few things
Add extra tests, just because.
Fix search ui tests
Add func tests for the <select>
Fix select default value