🚸 Add text if there is no entry for selected day

- Overlay if substitutions / history view is still loading
- Overlay if no substitution exists for current day
- Overlay if no history exists for current day

src/strings.js

@@ -76,6 +76,18 @@ export const strings = {
         },
       },
     },
+    infoCard: {
+      titles: {
+        loading: "Loading data",
+        noEntries: "No Substitutions",
+        noHistory: "No History",
+      },
+      texts: {
+        loading: "The data for this day is still being loaded",
+        noEntries: "There are no substitutions for this day yet",
+        noHistory: "No substitutions for this day have changed yet",
+      },
+    },
   },
   de: {
     title: {
@@ -155,5 +167,18 @@ export const strings = {
         },
       },
     },
+    infoCard: {
+      titles: {
+        loading: "Läd noch",
+        noEntries: "Keine Vertretungen",
+        noHistory: "Noch keine Änderungen",
+      },
+      texts: {
+        loading: "Die Daten für diesen Tag laden noch",
+        noEntries: "Es gibt noch keine Vertretungen für diesen Tag",
+        noHistory:
+          "An den Vertretungen für diesen Tag wurde noch nichts geändert",
+      },
+    },
   },
 };