This test requires Mobile services to be enabled.

1. Log in as an admin and go to 'Mobile features' in the Site administration.
2. Add some custom lang strings e.g

   mm.user.student|Learner|en
   mm.user.student|Aprendiz|es
   mm.user.student|Aprendiz|es_mx

3. Create a web services token for one standard user:
   • Click on Site administration > Plugins > Web services > Manage tokens
4. Next, you can do a CURL REST call simulating a WS client with the user.
   • You need to replace the wstoken, and the URL of your Moodle instance

     curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'wsfunction=tool_mobile_get_config&wstoken=12a2a65aeea2a177055e233f9e303218&section=mobileapp' | python -m "json.tool"

5. Check that you correctly receive the new custom lang strings.
6. Go to the mobile settings again, and remove all the custom lang strings.
7. Execute the curl request again and check that you now get an empty value for the custom lang strings.