I don't want to reinvent the wheel, just additional elaboration on what has already been said.
I agree with this herethis here.
Which is an extension of @svick's answer, but gives more detail and an example of a title that needs language as part of question and not as a tag.
If the language does not pertain to the actual question, it should be omitted.
Example being a question relating to the differences in python and jython, with jython's relationship to java.
How come I can do this in jython, but not in python?