Example for getting rid of select keyboard language.
1. Drag the notification bar down, scroll right to the bottom.
2. Select >Manage Notifications
3. Select >Three dot menu, (top right)
4. Select >Show System
5. Select >Android System
6. Select >Physical Keyboard by the text, not the check box
7. Toggle >Show notification
8. Select >Back and Back again
This will disable notifications without root.