ADD Language
The process is to ADD the language in the Admin Portal -> Settings -> Languages
then click the "+" icon.

Put "Language Name","Language Locale","Date Local" of which language you want to add.

Then click on the right sign to add.

It takes few minutes to process.

Now you can see language successfully added.

EDIT Language
The process is to EDIT the language in the Admin Portal -> Settings -> Languages
then click on "Edit Json".

Here you can edit language.

At last click on "SUBMIT" button,to save your editable languages.
