Implement i18N

[sebastian-code]

Is your feature request related to a problem? Please describe.
No, it is an improvement on the code base, and app usability.

Describe the solution you'd like
Implement language translations, using Django's own tools for i18N.

Describe alternatives you've considered
There are no alternatives I know about, but there is also no need.

Additional context
Identify all the strings actually in use, and mark them for translation. Also, implement a policy for future commits, making mandatory to keep strings ready for translation

[ChayoteJarocho]

I have the code to implement localization. I'll submit a PR that enables it.

The next step would be for other contributors to create the language file they're interested in and submit the translations. I can work on the Spanish file.

[elarroba]

Looking forward to your PR.

Miguel

[ChayoteJarocho]

Looking forward to your PR.

Miguel

Already submitted the first PR, @elarroba! #278

[ChayoteJarocho]

I have some questions, I left them in the PR. PTAL when you get a chance.