pylupdate5 forgets translations of lines containing Unicode

[Anton Yablokov]

Dear community,

I've just bumped into a troubling behavior of pylupdate5. Namely, it marks
the translations of lines containing Unicode symbols besides ASCII as
unfinished and actually removes the translation.

Here is an MWE:

from PyQt5.QtCore import QCoreApplication

_translate = QCoreApplication.translate
_translate('microvolts', 'uV')
_translate('microvolts', 'μV')


On it, run

 pylupdate5 -noobsolete *.py -ts microvolts.ts

once, then complete (and save) the translation using linguist, then run
pylupdate5 again with the same parameters. The translation of

'μV'

vanishes:

<         <translation>μV</translation>
---
>         <translation type="unfinished"></translation>

Checked with PyQt5 5.13.2 through 5.15.4 on Linux.

Best regards,
Anton Yablokov
🍏
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