Complete Portuguese translation of the web UI

[victor-nitu]

[carlosmouracorreia]

reference: https://wiki.rootio.net/development:i18n

[carlosmouracorreia]

A command was added to compile the translations (from .pot to .mo) so that the website can actually show the translations. This was not documented in the Wiki, and so I've added the command and documented it.

An updated version of the English translations was pushed (And therefore sent to Transifex).

Left out to complete is to actually translate the rest of Romanian and Portuguese statements.

@Luthieneye @judelove

[carlosmouracorreia]

Use "crontab -l" to set up a cron job to fetch translations and compile them.