Hi
Okay check in Kmail settings / editor configuration. Kmail antivirus / antispam wizard left untranslated.
In system settings the confirm dialog does contain untranslated buttons but situation has improved.
Window configure shortcuts in Dolphin / Konsole is partly left untranslated (click manage schemes).
Kate menu file > save as with encoding
On Polish locales ok / apply / cancel is translated. Now in French translation is correct when you right click on the clock and reach clock settings. Basically in French 95% of the bottom dialog buttons are untranslated (ex : konsole settings) while polish is not affected.
Kopete is also fully translated.
Kdevelop browse menu : jump to next / previous
Note : if the issue was just ok / apply / cancel I would not have set such high severity.
My locale : fr_FR.UTF-8