It is apparently a bug some have after updating to 10.10.2. To remove the numbers and bring back 'OS X Yosemite' you have to change your primary language. If you use English now, try to change your primary language to English UK instead. Restart the computer and 'OS X Yosemite' should appear in 'About This Mac'.
It should work. I forgot to mention that for some it has been necessary to choose English Canada as primary Language, instead of English UK. But nice to see you got it solved anyway.
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