Win32: Allow menu bar to be translated

It uses the vast majority of strings it can find from your existing translation INIs, and introduces several new strings to translate(which I'll upload to PPSSPP-Lang if this gets merged).

The idea first came up in https://github.com/hrydgard/ppsspp/issues/3467.

Sample screenshots from various stages of development(I think the Swedish screenshot is funky because the encoding is bad in the ini file):
![Screenshot 01](https://i.minus.com/i4GRhvB0nZiyQ.png)
![Screenshot 02](https://i.minus.com/iJ2wyRgOxJbMK.png)