Dundas does not seem to be using the locatiozation file that has been added to the localization in Set-up
Localization
How have you specified which localisation it should use?
You need to specify the culture on a per server/group/user/session level before it picks it up.
See https://www.dundas.com/support/learning/documentation/administration-configuration-customization/localization-and-multi-language-support