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Go ClassiPress Admin => Custom Fields
Select a field and then click to edit.
Change the name of the field and save.

Have you created a test ad with all location fields completed correctly? Are you using the AppThemes language pack related to your version? Perhaps if you share your URL this will help us look at the...

The only language file needed for installation and fr_FR.mo

Open the file "fr_FR.po" with Poedit, make the necessary changes and save. The file "fr_FR.mo will be updated automatically.

Now...