Revert "Multi lang"

Reverts monero-project/monero-site#95

@mikemcdonald Thanks for the effort you put into #95. I unfortunately had to revert this as it created an editing nightmare, and is going to make translations really difficult moving forward. I'll create an issue detailing the expected behaviour of the multilang plugin, and maybe if you have some time we can try work together in the next few weeks to bring it in line with that? Thanks!