For adding other language content into any section, after you enable the editing option and select click on edit -> edit topic.
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Once the section open with edit option, for adding Kannada text in to the section just add '''{mlang kn}''' ('kn' means Kannada, replace this with your language) before your text began and at the end of your text just add '''{mlang}'''. follow the same steps for any other language which is already installed in your Moodle server.