Localization Strings
.Localization strings of the portal can be modified by a theme.
The XML file must be included inside a def folder within the folder where the corresponding themedefinition.xml is located. Inside this def folder, the folder path should be created identical to that of the XML you wish to replace.
For example, if there is a file in a theme def/lumis/portal/strings/strings.en_us.xml containing:
The word that previously appeared translated as "Yes" will now appear as "Of course!" on the pages where this theme is applied.