[help_editor] Translate help editor module

[SKADE2303]

This PR is responsible for translating the module help_editor to different languages. Currently only 'Hindi' language is supported but other languages can be added as required.

Testing instructions (if applicable)

1. Run 'make dev' to load changes
2. Change language_preference to Hindi in my_preferences Tab
3. Go to help_editor tab to see translated web page.

[racostas]

@SKADE2303, please fix tests.

@christinerogers

[racostas]

^ @christinerogers , @driusan