fix(client): Fix the startup l10n/everything-else race condition. (#4438)
fix(client): Fix the startup l10n/everything-else race condition. (#4438)

fixes #2061

shane-tomlinson/fxa-content-server,mozilla/fxa-content-server,mozilla/fxa-content-server,shane-tomlinson/fxa-content-server,shane-tomlinson/fxa-content-server,mozilla/fxa-content-server