Add support for external translation tools (#968)

* Make some minor translation fixes
* Remove crowdin file and add import function for crowdin zip file
* Rename fallback project lang file to en_GB
* Update all i18n files from crowdin exports
* Fix tests
* Update docs

novelwriter/assets/i18n/project_en_US.json

@@ -0,0 +1,105 @@
+{
+  "Synopsis": "Synopsis",
+  "Comment": "Comment",
+  "Notes": "Notes",
+  "0": "Zero",
+  "1": "One",
+  "2": "Two",
+  "3": "Three",
+  "4": "Four",
+  "5": "Five",
+  "6": "Six",
+  "7": "Seven",
+  "8": "Eight",
+  "9": "Nine",
+  "10": "Ten",
+  "11": "Eleven",
+  "12": "Twelve",
+  "13": "Thirteen",
+  "14": "Fourteen",
+  "15": "Fifteen",
+  "16": "Sixteen",
+  "17": "Seventeen",
+  "18": "Eighteen",
+  "19": "Nineteen",
+  "20": "Twenty",
+  "21": "Twenty-One",
+  "22": "Twenty-Two",
+  "23": "Twenty-Three",
+  "24": "Twenty-Four",
+  "25": "Twenty-Five",
+  "26": "Twenty-Six",
+  "27": "Twenty-Seven",
+  "28": "Twenty-Eight",
+  "29": "Twenty-Nine",
+  "30": "Thirty",
+  "31": "Thirty-One",
+  "32": "Thirty-Two",
+  "33": "Thirty-Three",
+  "34": "Thirty-Four",
+  "35": "Thirty-Five",
+  "36": "Thirty-Six",
+  "37": "Thirty-Seven",
+  "38": "Thirty-Eight",
+  "39": "Thirty-Nine",
+  "40": "Forty",
+  "41": "Forty-One",
+  "42": "Forty-Two",
+  "43": "Forty-Three",
+  "44": "Forty-Four",
+  "45": "Forty-Five",
+  "46": "Forty-Six",
+  "47": "Forty-Seven",
+  "48": "Forty-Eight",
+  "49": "Forty-Nine",
+  "50": "Fifty",
+  "51": "Fifty-One",
+  "52": "Fifty-Two",
+  "53": "Fifty-Three",
+  "54": "Fifty-Four",
+  "55": "Fifty-Five",
+  "56": "Fifty-Six",
+  "57": "Fifty-Seven",
+  "58": "Fifty-Eight",
+  "59": "Fifty-Nine",
+  "60": "Sixty",
+  "61": "Sixty-One",
+  "62": "Sixty-Two",
+  "63": "Sixty-Three",
+  "64": "Sixty-Four",
+  "65": "Sixty-Five",
+  "66": "Sixty-Six",
+  "67": "Sixty-Seven",
+  "68": "Sixty-Eight",
+  "69": "Sixty-Nine",
+  "70": "Seventy",
+  "71": "Seventy-One",
+  "72": "Seventy-Two",
+  "73": "Seventy-Three",
+  "74": "Seventy-Four",
+  "75": "Seventy-Five",
+  "76": "Seventy-Six",
+  "77": "Seventy-Seven",
+  "78": "Seventy-Eight",
+  "79": "Seventy-Nine",
+  "80": "Eighty",
+  "81": "Eighty-One",
+  "82": "Eighty-Two",
+  "83": "Eighty-Three",
+  "84": "Eighty-Four",
+  "85": "Eighty-Five",
+  "86": "Eighty-Six",
+  "87": "Eighty-Seven",
+  "88": "Eighty-Eight",
+  "89": "Eighty-Nine",
+  "90": "Ninety",
+  "91": "Ninety-One",
+  "92": "Ninety-Two",
+  "93": "Ninety-Three",
+  "94": "Ninety-Four",
+  "95": "Ninety-Five",
+  "96": "Ninety-Six",
+  "97": "Ninety-Seven",
+  "98": "Ninety-Eight",
+  "99": "Ninety-Nine"
+}

novelwriter/assets/i18n/project_zh_CN.json

@@ -32,7 +32,7 @@
   "27": "二十七",
   "28": "二十八",
   "29": "二十九",
-  "30": "三十",   
+  "30": "三十",
   "31": "三十一",
   "32": "三十二",
   "33": "三十三",