The following filtering options are available for non-English words:

Elisions	Use FilterElisions to filter elisions from words during indexing. For example, l'avion (the plane) will be tokenized as avion (plane). So a search for l'avion and avion would both work and return the same result.
Accent Marks	Use FilterAccents to remove accent marks from Latin characters during indexing. For example, à will be replaced by a and can be searched without accents.

These options need to be configured in starteam-search-configs.xml. Use 1 to enable the option. For example:

<option name="FilterElisions" value="0"/><option name="FilterAccents" value="1"/>