Started converting the app to a true MVVM architecture; fixed 7 month old bug that would cause substitution items to not be shown on the personal plan if they contained a question mark (e.g. 'INF7?inf999')

app/src/main/res/values-de/strings.xml

@@ -2,7 +2,7 @@
 <resources>
     <string name="app_name">AvH-Plan</string>
     <string name="filters">Filter</string>
-    <string name="no_internet_connection">Keine Internetverbindung</string>
+    <string name="an_error_occurred">Ein Fehler ist aufgetreten</string>
     <string name="general">Allgemein</string>
     <string name="grade">Klasse</string>
     <string name="courses">Kurse</string>
@@ -192,4 +192,6 @@
         <item>Weiß</item>
         <item>Schwarz</item>
     </string-array>
+    <string name="plan_updated">Der Plan wurde aktualisiert</string>
+    <string name="food_menu_updated">Der Speiseplan wurde aktualisiert</string>
 </resources>

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

@@ -3,7 +3,7 @@
     <string name="app_name">AvH Plan</string>
     <string name="substitution_plan">Substitution Plan</string>
     <string name="filters">Filters</string>
-    <string name="no_internet_connection">No internet connection</string>
+    <string name="an_error_occurred">An error has occurred</string>
     <string name="general">General</string>
     <string name="grade">Grade</string>
     <string name="courses">Courses</string>
@@ -205,4 +205,6 @@
         <item>White</item>
         <item>Black</item>
     </string-array>
+    <string name="plan_updated">The plan has been updated</string>
+    <string name="food_menu_updated">The food menu has been updated</string>
 </resources>