Make parameters removing special characters

Author: Wayne Wanbok Choi

Sources/POEditorParser/Lib/LiteralsParser.swift

@@ -29,7 +29,10 @@ struct Variable {
          - alreadyReadPages <- this should not be captialized (or we'll lose the Read and Pages capital letters)
          */
 
-        let words = rawKey.split(separator: " ").map(String.init)
+        let words = rawKey
+            .components(separatedBy: .alphanumerics.inverted)
+            .flatMap { $0.split(separator: " ") }
+            .map(String.init)
         if words.count == 1 {
             return words[0].lowercaseFirst
         }