merge: Tidy the code - Part 3

 * fix: typo in browser_compare_count{_new}
 * build: remove generated files from repo
 * tidy: comments
 * build: look for translations in all files
 * fix: arguments to printf-style functions
 * tidy: license text
 * tidy: unify include-guards
 * build: tidy makefiles
 * tidy: initialise pointers
 * tidy: make strcmp-like functions clearer
 * tidy: unify sizeof usage
 * build: remove forward declarations
 * tidy: remove ()s from return