Russian text leaves an empty line whenever TextScaled is set to true.
I have also noticed that Russian text is displayed at a slightly larger font size compared to all the other languages.
Both have a TextSize of 14 but are displayed at different sizes.
It maybe has to do something with Text Alignment, as for the size, cyrillic letters are larger than latin ones so you can’t do anything about it exept trying to scale it down as @goldencowboy said.
That’s because cyrillic is not supported in some fonts, and it automatically rolls back to Arial, which is bigger than SourceSans. Because of that, text scaling is a little off.
Here you can see 2 TextLabels with different fonts. Notice how russian text looks exactly the same: