Uniform file names in the Languages directory #2244
Description
The problem
When the filename includes two words, _ and - are used indistinctly: grammar_tutorial and io-guide, for instance.
Suggestions
It wouldn't be good to change URLs now since we would lose lots of links, but we might want to decide on a uniform way of separating words in file names and, if names are changed, create redirections. While we're at it, we might want to give uniform names to "tutorials", "guides", and "howtos". There's an IO "guide" and a grammars "tutorial". There are also Python, Ruby and other "nutshell", but a Haskell-to-p6.
Underscores are only used in 3 files. We might want to change those three names and include indirections in the .htaccess file. Dashes are better than underscores, too.