Selecting every party option will not help you get a party faster. The above comment, though extreme, is how I interpret someone who selects every flag.
I'm not really sure what this update was trying to fix, given that the German and French speakers are fluent enough in English to get by. You won't see a "G ONLY" or a "F ONLY" pt, why? Because it's only the Japanese that do that, and the reason is because they hate gaijin - aka anyone who doesn't speak Japanese. Unless, of course, you're one of the wanted jobs. Yorosiku, NA bard-sama.
I'm not sure what got mistranslated, but the "Language" help text isn't referring what language-speaking parties you prefer, it's about what languages you can speak, a point that should have become obvious while reading the "Other" help text.
Expect a number of polyglots in the coming months. By the way, my friend is Lithuanian, where's the "L" option?