Add 'Languages' to nav bar

[veganstraightedge]

• [ ] Place it between "Search" and "About"
• [ ] Be sure to use the translation, not a string literal

[QueerSynd]

Should it link to the section in the footer, or should it be a dropdown with the languages listed?

[veganstraightedge]

I think, for now, it should link to https://crimethinc.com/languages

Sorry for not including that in the issue description. I was probably moving too fast when I made it!