feat(src/app/App): display correctly help in the correct locale

linphone-desktop/assets/languages/en.ts

@@ -78,11 +78,11 @@
     </message>
     <message>
         <source>commandLineOptionHelp</source>
-        <translation type="unfinished"></translation>
+        <translation>show this help</translation>
     </message>
     <message>
         <source>commandLineOptionVersion</source>
-        <translation type="unfinished"></translation>
+        <translation>show app version</translation>
     </message>
 </context>
 <context>

linphone-desktop/assets/languages/fr.ts

@@ -78,11 +78,11 @@
     </message>
     <message>
         <source>commandLineOptionHelp</source>
-        <translation type="unfinished"></translation>
+        <translation>affiche cette aide</translation>
     </message>
     <message>
         <source>commandLineOptionVersion</source>
-        <translation type="unfinished"></translation>
+        <translation>affiche la version de l&apos;application</translation>
     </message>
 </context>
 <context>

linphone-desktop/src/app/App.cpp

@@ -90,10 +90,11 @@ App::App (int &argc, char *argv[]) : SingleApplication(argc, argv, true) {
   mTranslator = new DefaultTranslator(this);
   initLocale();
 
-  parseArgs();
-
-  if (mParser->isSet("help"))
+  if (mParser->isSet("help")) {
+    parseArgs();
     mParser->showHelp();
+  }
+
   if (mParser->isSet("version"))
     mParser->showVersion();
 }