Static labels that are used in the WebHelp output are kept in translation files in the [OXYGEN_DIR]/frameworks/docbook/xsl/com.oxygenxml.webhelp/oxygen-webhelp/resources/localization folder. Translation files have the strings-lang1-lang2.xml name format, where lang1 and lang2 are ISO language codes. For example, the US English text is kept in the strings-en-us.xml file.
To localize the interface of the WebHelp output for DocBook transformations, follow these steps: