Striker - Automatically adapts to the language set on your device. Open the device's own Settings and the language tab, to switch.
In some devices, Striker updates itself automatically after changing the language, but sometimes the user has to manually shut down the Striker app completely and re-open it for the update to appear.
NOTE! Sync before the app is shut down!
Officer - Click on the user's name at the bottom left of the page. Then click on the edit icon in the top right corner and select language in the "Language" field. The new language setting will be used from the next page displayed in Officer.