To support stemming for a language, the search mechanism requires a stemmer implemented in both Java and JavaScript. The Java version is used by the indexer and the JavaScript verison is used to stem the user's input on the search form. Currently the search mechanism supports stemming for English and German. In addition, Java stemmers are included for the following languages. Therefore, to support these languages, you only need to implement the stemmer in JavaScript and add it to the template_mobile. If you do undertake this task, please consider contributing the JavaScript version back to this project and to Martin Porter's project.