Move all labels from the Android manifest to the string table

This will allow those to be translated as well.

src/app/android/AndroidManifest.xml

@@ -17,10 +17,10 @@
     <!-- %%INSERT_PERMISSIONS -->
     <!-- %%INSERT_FEATURES -->
 
-    <application android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="KDE Itinerary" android:icon="@mipmap/ic_launcher">
+    <application android:name="org.qtproject.qt5.android.bindings.QtApplication" android:label="@string/application_name_full" android:icon="@mipmap/ic_launcher">
         <activity android:configChanges="orientation|uiMode|screenLayout|screenSize|smallestScreenSize|layoutDirection|locale|fontScale|keyboard|keyboardHidden|navigation"
                   android:name="org.kde.itinerary.Activity"
-                  android:label="Itinerary"
+                  android:label="@string/application_name_short"
                   android:windowSoftInputMode="adjustResize"
                   android:launchMode="singleTop">
 

src/app/android/res/values/strings.xml

@@ -4,6 +4,9 @@
     SPDX-License-Identifier: CC0-1.0
 -->
 <resources>
+    <string name="application_name_full">KDE Itinerary</string>
+    <string name="application_name_short">Itinerary</string>
+
     <string name="shortcut_label_current_ticket_short">Current Ticket</string>
     <string name="shortcut_label_health_certs_short">Health Certficates</string>
 </resources>