Language depend on the Server?

I wanted to play League with the russian Language pack but i saw i can only log in with it on the russian server (im on Euw) Why is this like this and can i play with the russian pack in anyway on another server other than Russian?

We're testing a new feature that gives the option to view discussion comments in chronological order. Some testers have pointed out situations in which they feel a linear view could be helpful, so we'd like see how you guys make use of it.

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