You have opened a project. Options > Settings > Projects > "Project name" > Translation > Translatable pages.
In this dialog you specify via the page type which pages are to be translated. This settings are stored on a project-specific basis.
The following dialog elements are available:
This field displays all of the available page types in EPLAN. If the check box in front of the page type is selected, all pages of this type are translated. If the check box in front of the page type is deselected, pages of this type are not translated.
See also
Automatic / Manual Translation
Generally Translating / Not Translating Texts and Properties