You can change the language of frontend by doing following.
Login to the admin panel.
Go to Settings -> Frontend Settings.
You will see select language dropdown there, from where you can change the language.
Click on Save.
Refresh Frontend to see the changes, and if not reflected then clear cache of frontend and check again.
You can customise following sections from Frontend settings in admin panel.
Count of cities and vehicles.
Owners ( Mind behind fleet )
Contact details ( e.g. number, email, address and map )