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/tools/build.py

@@ -1351,7 +1351,7 @@ class GuiBuildNovelDocView(QTextBrowser):
         else:
             strBuildTime = self.tr("Unknown")
 
-        self.theTitle.setText(self.tr("<b>Build Time:</b> {0}").format(strBuildTime))
+        self.theTitle.setText("%s %s" % (self.tr("Build Time:"), strBuildTime))
 
         return