As admin, install the Italian and Portuguese language packs via Site administration > Language > Language packs Download and install the Mod Custom Certificate plugin from here: https://github.com/markn86/moodle-mod_customcert/archive/MOODLE_36_STABLE.zip (the contents of the zip has to be placed in the mod/customcert folder) Now, in the language settings, enable the option "Display language menu" and in the "Languages on language menu" option set the following value "en, it" As admin, enable "Mobile services": Site administration ► Mobile app ► Mobile settings Create a Token in the mobile app service for any user in the site (not an admin account) Click on Site administration ► Plugins ► Web services ► Manage tokens Open the console an execute this new curl request, replacing wstoken with the token you just created and the site url with yours. curl 'http://localhost/m/stable_master/webservice/rest/server.php?moodlewsrestformat=json' --data 'wsfunction=tool_mobile_get_plugins_supporting_mobile&wstoken=3af67232a7596ceb658df4db329e5ad6' | python -m "json.tool" And check that among the returned data you see a field "lang" with a json string that contains strings in English, Italian and Portuguese