Internationalize app

[uo288347]

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[PabloGOP]

From #270

Status

As for now, I think every page and test is up-to-date excepting:

• Instructions
• Homepage

As these require special treatment as long as they use data from an external source.

How to use

In pages in which internationalization is being applied:

• Call t("key_of_jsons_message") whenever you want to insert a string
• Make sure key_of_jsons_message is properly setted in all the webapp/src/localize/*.json files

In pages in which internationalization is NOT being applied:

• Import useTranslation
• Define in the component t: const { t } = useTranslation();
• See previous entry

[PabloGOP]

I keep it open to remember:

• Inter missing pages
• Question generation has to be leveraged