Sorry for my bad english, so I've capture screen for report problem.
Windows 7 (64 bits), French (no problem with English), Toucan 3.1.5 (same with all 3.1.x, but no problem with 3.0.4).
Start of the test:
End of the test:
So, I have remaining to version 3.0.4.
Same start, in English: https://alexou.fr.cr/email/files/bug-toucan/start.png
End, in English: https://alexou.fr.cr/email/files/bug-toucan/end.png
Same start, with "preview only changes" option, in French: https://alexou.fr.cr/email/files/bug-toucan/debut1b.png
End, in French: https://alexou.fr.cr/email/files/bug-toucan/fin1b.png
Same start, with "preview only changes" option, in English: https://alexou.fr.cr/email/files/bug-toucan/start1b.png
End, in English: https://alexou.fr.cr/email/files/bug-toucan/end1b.png
Comment for this option and "skipped" in reply: https://portableapps.com/node/56494#comment-232633
More screenshots, again.
Start 2, in English (with files to be deleted during the operation): https://alexou.fr.cr/email/files/bug-toucan/start2.png
End2, in English: https://alexou.fr.cr/email/files/bug-toucan/end2.png
Same Start2, in French: https://alexou.fr.cr/email/files/bug-toucan/debut2.png
End2, in French: https://alexou.fr.cr/email/files/bug-toucan/fin2.png
Comment for "deleted", "removed", "elapsed", and "finished" in reply: https://portableapps.com/comment/232783#comment-232783 (re-edited)