Factorio Forums

while not obvious, this issue of missing translations is independent of the language you are looking at, so this is in fact a duplicate of viewtopic.php?f=12&t=121260 reporting missing translations in Chinese (?)

Those translations have been provided and are available in 2.0.18 experimental.

Except the biochamber. That one does not have a technology description in English either so there is no Russian translation. And that technology description missing is apparently not a bug, as seen here with a different tech: viewtopic.php?f=23&t=116402

Sometimes not enough time passes between uploading changed/added strings to Crowdin and releasing a new version of the game for translators to see the updated strings and translate them.
Wait for the next game update in that case.
P.S. The Russian language is 100% translated within a few hours after adding/changing strings.