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Same problem than you guys - and mine went back in English on a French localization for the first Beta in 3 years :p
Of course these kind of bugs will be corrected for the final release.
 
report it with the feedback tool, this is something Apple probably wont fix for several months unless a lot of people complain during beta
 
I just change the size iff the icons to small and that solves it for me to see the entire text. But if you have external drives with long names, probably wouldn't help you.
 
Just installed El Capitan, so far everything seems butter smooth except this thing with the sidebar :) Guess theres no fix for it except waiting for another update. ...downgrading to yosemite is at least not an option, since everything else seems better and faster. Like getting a new machine really.

Send feedback! don't just wait.. SEND FEEDBACK.. or it won't get fixed. :(
 
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