Tags are very useful, especially if they have a tag wiki excerpt, i.e. a short description of the tag's scope. However, at the time of writing, our site appears to have dozens of tags with empty tag wiki excerpts or empty tag wikis.
You can run this query to find all tags with an empty tag wiki excerpt, an empty tag wiki or both.
Let us at least fill in the empty tag wiki excerpts, since these are the texts that become visible on hover (e.g. when adding tags to a question). Based on the meta post Style to be used in tag wikis' summaries?, the format for the tag wiki excerpts should be as follows:
French description / English description.
So let's start doing this :-)
PS: This post was inspired by Fill the empty tag excerpts on Science Fiction and Fantasy. The query was forked from the query in that meta question.