feat: Add feedback modal

public/i18n/de.json

@@ -20,6 +20,8 @@
   "the-vdrd": "VdRD e.V.",
   "imprint": "Impressum",
   "source-code": "Quellcode",
+  "give-feedback": "Feedback geben",
+  "feedback": "Feedback",
   "failed-base-area": "Die Mindestgrundfläche des Käfigs muss {{ MINIMUM_BASE_AREA }}m² (also z.B. 100x50cm) betragen.",
   "failed-overall-area": "Die Gesamtfläche im Käfig ist zu klein.",
   "failed-fall-height": "Die mögliche Fallhöhe darf nicht mehr als {{ maximum_fall_height }}cm betragen.",

public/i18n/en.json

@@ -20,6 +20,8 @@
   "the-vdrd": "VdRD r.V.",
   "imprint": "Imprint",
   "source-code": "Source Code",
+  "give-feedback": "Give Feedback",
+  "feedback": "Feedback",
   "failed-base-area": "The base area of the cage must not be below {{ MINIMUM_BASE_AREA }}m².",
   "failed-overall-area": "The overall area in the cage is to small.",
   "failed-fall-height": "The possible fall height between floors must not be above {{ maximum_fall_height }}cm.",