CRM Language can be changed from the Profile settings page. It will only change the UI language.
1) Login into your CRM and click on the User icon at the top right-hand corner of the Home screen. After that click on Profile option from the drop-down list.
2) From the Profile, menu clicks on the Language option and select your preferred language from the list. Once you are done with the selection then click on Save.
Note: If you want to enter some letters / Characters with different language then you need to change the keyboard input language of your computer.