Reduces client.js size by about 250kB (800kB uncompressed)

Common languages:
bash, c, cpp, csharp, css, diff, go, graphql, ini, java, javascript,
json, kotlin, less, lua, makefile, markdown, objectivec, perl,
php-template, php, plaintext, python-repl, python, r, ruby, rust, scss,
shell, sql, swift, typescript, vbnet, wasm, xml, yaml

Additionally enabled languages:
dockerfile, pgsql

Allows to individually enable languages.

Allows to enable additional languages that will not be autodetected.