The should be a new Table or json file with all Messages, in all desired Languages.
This should be done in the Back-end, to deliver the Error-messages and the Messages for the User-Feedback in the desired Language.
Also all Button-Labels and everything should be based on this Language Table.
For the Frontend-Texts the Texts should be transfered once at startup of the App.
The setting for the Language should be done maybe Token.
The should be a new Table or json file with all Messages, in all desired Languages. This should be done in the Back-end, to deliver the Error-messages and the Messages for the User-Feedback in the desired Language.
Also all Button-Labels and everything should be based on this Language Table. For the Frontend-Texts the Texts should be transfered once at startup of the App. The setting for the Language should be done maybe Token.