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If you are using lazyblorg to generate your blog, you may now override the auto-detected language for each article.
So far, the software supports German and English. The resulting auto-tags are language:deutsch and language:english respectively. In case the algorithm is not sure about the language, it results in language:unsure.
In any case, you may now override the language auto-tag by assigning a normal user tag like :deutsch: or :english:. On my blog here, you may find examples of overridden language tags on this, this or this article.
Everything related to tags and auto-tags is now documented in the new Wiki page for tags.