I18n implementation

[NeroxTGC]

i18n implementation

• Browser Language detector
• Fallback/default language: EN
• Available languages: EN/ES
• Added LanguageSelector to the NavBar

Translated:

• Landing Page
• Pricing Page
• Account Page
• FileUploadPage
• DemoAppPage
• NavBar component
• UserMenuItems component
• Footer component

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Contributor Checklist

Make sure to do the following steps if they are applicable to your PR:

(not done)

• Update e2e tests: If you changed the /template/app, then make sure to do any neccessary updates to /template/e2e-tests also.
• Update demo app: If you changed the /template/app, then make sure to do any neccessary updates to /opensaas-sh/app_diff also. Check /opensaas-sh/README.md for details.
• Update docs: If needed, update the /opensaas-sh/blog/src/content/docs.

[Martinsos]

Cool stuff @NeroxTGC !
What do you say @vincanger ? Makes sense to me (I haven't checked the code, but as a concept). I guess the question is if it is possibly too much to put in the template, but I guess it might be fine, people have asked for it quite often? If not we can potentially move it into a guide instead hm.