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

setup.py

@@ -27,6 +27,7 @@ along with this program. If not, see <https://www.gnu.org/licenses/>.
 import os
 import sys
 import shutil
+import zipfile
 import datetime
 import subprocess
 import email.utils
@@ -435,6 +436,47 @@ def buildSampleZip():
 #  Python Packaging
 # =============================================================================================== #
 
+##
+#  Import Translations (import-i18n)
+##
+
+def importI18nUpdates(sysArgs):
+    """Import new translation files from a zip file.
+    """
+    print("")
+    print("Import Updated Translations")
+    print("===========================")
+    print("")
+
+    fileName = None
+    if len(sysArgs) >= 2:
+        if os.path.isfile(sysArgs[1]):
+            fileName = sysArgs[1]
+
+    if fileName is None:
+        print("File not found ...")
+        sys.exit(1)
+
+    projPath = os.path.join("novelwriter", "assets", "i18n")
+    mainPath = "i18n"
+
+    print("Loading file: %s" % fileName)
+    with zipfile.ZipFile(fileName) as zipObj:
+        for archFile in zipObj.namelist():
+            if archFile.startswith("nw_") and archFile.endswith(".ts"):
+                zipObj.extract(archFile, mainPath)
+                print("Extracted: %s > %s" % (archFile, os.path.join(mainPath, archFile)))
+            elif archFile.startswith("project_") and archFile.endswith(".json"):
+                zipObj.extract(archFile, projPath)
+                print("Extracted: %s > %s" % (archFile, os.path.join(projPath, archFile)))
+            else:
+                print("Skipped: %s" % archFile)
+
+    print("")
+
+    return
+
+
 ##
 #  Make Minimal Package (minimal-zip)
 ##
@@ -1514,6 +1556,7 @@ if __name__ == "__main__":
         "",
         "Python Packaging:",
         "",
+        "    import-i18n    Import updated i18n files from a zip file.",
         "    minimal-zip    Creates a minimal zip file of the core application without",
         "                   all the other source files. Defaults to tailor the zip file",
         "                   for the current OS, but accepts a target OS flag to build",
@@ -1597,6 +1640,11 @@ if __name__ == "__main__":
     # Python Packaging
     # ================
 
+    if "import-i18n" in sys.argv:
+        sys.argv.remove("import-i18n")
+        importI18nUpdates(sys.argv)
+        sys.exit(0)  # Don't continue execution
+
     if "minimal-zip" in sys.argv:
         sys.argv.remove("minimal-zip")
         makeMinimalPackage(targetOS)