fix(ui/cli): don't print a groovy runtime exception due to wrong API

usage

Previously the argument was omitted causing an uncaught
org.codehaus.groovy.runtime.metaclass.MethodSelectionException to be
thrown because Groovy could not determine the correct constructor.

ui/cli/src/main/groovy/com/github/thetric/iliasdownloader/cli/CliService.groovy

@@ -54,7 +54,7 @@ class CliService {
         final CliBuilder cliBuilder = createCliBuilder()
         final OptionAccessor opts = cliBuilder.parse(args)
         if (!opts) {
-            throw new InvalidUsageException()
+            throw new InvalidUsageException(resourceBundle.getString('args.invalid'))
         }
         return opts
     }

ui/cli/src/main/resources/ilias-cli.properties

@@ -1,6 +1,7 @@
 args.course.selection=show dialog to select courses to sync
 args.directory = Directory
 args.directory.description = Directory for the sync (required)
+args.invalid=Invalid arguments!
 args.sync.max-size=size limit in MiB per file download (exclusive)
 args.sync.max-size.negative=max download size per item must not be negative:
 
@@ -14,3 +15,4 @@ sync.finished = Sync finished
 sync.courses.available=Available courses:
 sync.courses.prompt=Enter the numbers of the courses to sync (separate by a space) or leave blank to select all
 sync.courses.prompt.errors.out-of-range=Invalid course selection! The selection must contain indices between 1 and {0}
+

ui/cli/src/main/resources/ilias-cli_de.properties

@@ -1,6 +1,7 @@
 args.course.selection=zeigt einen Dialog zur Auswahl der zu synchronisierenden Kurse an
 args.directory = Ordner
 args.directory.description = Zielordner fr die Synchronisierung
+args.invalid=Ungültige Kommandozeilenargumente!
 args.sync.max-size=maximale Größe der herunterzuladenen Datei in MiB (exklusive)
 args.sync.max-size.negative=Downloadlimit pro Datei darf nicht negativ sein: