Some improvements for Internationalization

I fixed some issues in my French translation that I didn't see the first time.

Also, I saw that the About_us page wasn't fully translated (some text was hard-coded).
=> I added some keys in the locales for this page (check "Our Story" & "Contact Us") and added their translations in FR and PT (for this one please check once more after me).

Finally, would that be possible to add the FAQ to the local files so that I can translate them ?

Thanks