While I understand the premise behind this idea I fear it has a number of problems
- Many programming questions don't have a language in the title
"Code won't work!"
"When I run the foo bar happens"
- who am I kidding, we never get good titled meta programming questions
- Many non programming questions do have a language in the title
"Code formatting is broken on the java tag"
"There’s a problem in the C++ community with ...."
For example here are 2000 posts with java in them that are not deleted
- People who post programming questions on meta don't seem to read anything ever, so a pop up is unlikely to faze them.
For those reasons I believe this would have more false positives than real postives which would make it more of a distraction than a help: every wrong popup makes people less likely to read the next popup