localisation in hoi4 can use unescaped quotes inside the loc line and will take the last quote on the line as the closing quote
examples of valid and invalid loc in hoi4
l_english:
loc_key1: "this is valid loc"
loc_key2: "this is "also" valid loc"
loc_key3: "this is \"also\" valid loc"
loc_key4: "this is \"also valid loc"
loc_key5: "this is "also valid loc"
loc_key6: "this is invalid loc
loc_key7: this is invalid loc"
loc_key8: this is invalid loc
loc_key9: "this is valid loc" but with invalid stuff outside
loc_key10: "this is valid loc" #but with comment
loc_key11: "this is valid loc" #but this is also valid and read as part of the string due to quote after "