Wikidata is a multilingual project, but due to the size of the project it is hard to get a view on the usage of languages.
For some time now the Wikidata dashboards have existed on the Wikimedia grafana install. These dashboards contain data about the language content of the data model by looking at terms (labels, descriptions and aliases) as well as data about the language distribution of the active community.
For reference the dashboard used are:
All data below was retrieved on 1 February 2016