Adding a new language to WebHelp Responsive output

To add a new language for WebHelp transformations, you need to create a DITA Open Toolkit extension plugin that uses the dita.xsl.messages extension point. The following sample procedure is for adding translation files for the Polish language, but you can adapt it for any language:

Create a com.oxygenxml.webhelp.localization plugin directory inside the [DITA-OT DIR]/plugins/ location.

Create a plugin.xml file inside that com.oxygenxml.webhelp.localization directory with the following content:

<plugin id="com.oxygenxml.webhelp.localization">
    <require plugin="com.oxygenxml.webhelp.classic"/>
    <require plugin="com.oxygenxml.webhelp.responsive"/>
						
    <feature extension="dita.xsl.strings" file="webhelp-extension-strings.xml"/>
</plugin>

Create a webhelp-extension-strings.xml file with the following content:

<langlist>
    <lang xml:lang="pl"    filename="strings-pl-pl.xml"/>
    <lang xml:lang="pl-PL"    filename="strings-pl-pl.xml"/>
</langlist>

Copy the WebHelp strings file ([DITA-OT DIR]/plugins/com.oxygenxml.webhelp.responsive/oxygen-webhelp/resources/localization/strings-en-us.xml) to your plugin directory, and rename it as strings-pl-pl.xml.
In the strings-pl-pl.xml file, change the @xml:lang attribute on the root element that conforms with the new language.
```
<strings xml:lang="pl-PL">
  ...
</strings>
```

Translate the content of each <str> element (make sure to leave the name attribute unchanged).

<strings xml:lang="pl-PL">
...
 <str name="webhelp.content" js="true" php="false">Polish translation for "Content".</str>
 <str name="webhelp.search" js="true" php="false">Polish translation for "Search"</str>
...
</strings>

Copy the common DITA-OT strings defined in the [DITA-OT DIR]/xsl/common/strings-en-us.xml file. It defines a set generated text available for HTML based transformations (such as note, fig, and table elements). Translate the content of each <str> element.

<strings xml:lang="pl-PL">
...
 <str name="webhelp.content" js="true" php="false">Polish translation for "Content".</str>
 <str name="webhelp.search" js="true" php="false">Polish translation for "Search"</str>
...
 <str name="Figure">Polish translation for "Figure"</str>
 <str name="Table">Polish translation for "Table"</str>
...
</strings>

Use the Run DITA-OT Integrator transformation scenario found in the DITA Map section in the Configure Transformation Scenario(s) dialog box.
In the [DITA-OT DIR]/bin directory of the DITA Open Toolkit, run one of the following scripts, depending on your operating system:
- Windows: [DITA-OT DIR]/bin/dita.bat --install
- Linux/Mac OS X: [DITA-OT DIR]/bin/dita.sh --install