Russian version crashing exactly 10min in is bizarre! I've never heard of that. Random crashes, yes, exactly 10min in, no.... I've also never heard of Upgrade Building not working. That's absolutely bizarre. Oh, well, at least the English version works.... so, uh, use that?
Cafeteria's Online Patch Library does now timeout, yes. The good news is that every patch on there can be fished up out of RRU's database, if you're prepared to do a little trawling (there are a lot of goodies there!).
In order to run Community Edition you'll need Community Edition + the CE DLL + the CE:Core Cafeteria patch, which is uploaded here + Cafeteria to use the patch.
As for some starters on language modding:
firstly, you'll want Wad Recycler to unpack and repack the WAD files (you don't even need to repack them if you remove the existing wad files and put all the folders in the LegoRR0 / LegoRR1 folders under Data)
LegoRR1.wad contains most of the language-related stuff. Level briefings are in ObjectiveText.txt , names (for levels and buildings alike) are in Lego.cfg , mid-level messages from Chief are in the Levels folder usually called 05.txt or something. (These last files also exist in LegoRR0.wad, but the game seems to never use this version, so don't worry about them)
Voiced sounds (like level names) are under LegoRR1/sounds
Font is in LegoRR0/Fonts - I suspect this is engine-specific and probably the most likely cause of the crash (we could never really get custom fonts ingame because the system was such a mess).
Make a backup of your files first, of course!
I suspect the game should be perfectly stable (well, as stable as LRR gets) if you change all the names, change all the level-specific stuff, put the Russian sounds in, but don't touch the font side of things. I guess once you've done all that you could make a backup, then try the font stuff, and if that crashes then switch back to the backup you just made.
Getting that all working within Cafeteria is going to be a bit messy: my usual recommendation is:
1) Make a new LRR installation
2) Put all your modded files in
3) Then add Cafeteria
4) and continue from there like normal
If you're feeling particularly brave, you could try and make it a Cafeteria patch, but you really don't need to do that!
Feel free to continue the topic with language modding questions or whatever