Import L10n
fix typo
Merge pull request #5075 from coolwanglu/master

fix typo
Version 1.0.473
Merge pull request #5080 from yurydelendik/ver-1.0.473

Version 1.0.473
Fixes typo in promises implementation for legacy browsers
Merge pull request #5081 from timvandermeij/promises-typo

Fixes typo in promises implementation for legacy browsers
Added an help button in the menu that displays a guided tour of the UI