I can confirm the same behavior in french.
$sudo gdebi mysql-workbench-oss-5.2.21-1ubu1004-amd64.deb
...snip...
Voulez-vous installer le paquet logiciel ? [o/N] :o
--> won't work (with any character)
LC_ALL=C sudo gdebi mysql-workbench-oss-5.2.21-1ubu1004-amd64.deb
...snip...
Do you want to install the software package? [y/N]:y
--> works
** Changed in: gdebi (Ubuntu)
Status: New => Confirmed
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gdebi CLI: can't confirm installation in Russian translation
https://bugs.launchpad.net/bugs/577140
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