- First implementation of filter for languages. - Language is now an array in the document - various corrections linked to the above change - Simplify the IndexDocumet loop

{{#if value}}{{value}}{{/if}}<span class="doc-supsub">{{#if lang}}<sup>{{lang}}</sup>{{/if}}{{#if datatype}}<sub>{{datatype}}</sub>{{/if}}</span>