feat: add floating button to give feedback

public/i18n/de.json

@@ -10,6 +10,7 @@
   "full-floors": "Vollebenen",
   "result": "Ergebnis",
   "number-of-rats": "Anzahl an Ratten",
+  "give-feedback": "Feedback geben",
   "change-language": "Sprache ändern",
   "information-on-rat-husbandry": "Information",
   "basic-rat-info": "Basiswissen Ratten",
@@ -20,7 +21,6 @@
   "the-vdrd": "VdRD e.V.",
   "imprint": "Impressum",
   "source-code": "Quellcode",
-  "give-feedback": "Feedback geben",
   "feedback": "Feedback",
   "sus-title": "Bewerte den Rechner",
   "explanation-feedback": "Vielen Dank, dass du uns Feedback gibst! Dein Feedback hilft uns den Rechner zu verbessern. Wir sammeln dabei keinerlei persönliche Daten. Du tust uns einfach nur einen großen Gefallen!",

public/i18n/en.json

@@ -10,6 +10,7 @@
   "full-floors": "Full floors",
   "result": "Result",
   "number-of-rats": "Number of Rats",
+  "give-feedback": "Give Feedback",
   "change-language": "Change language",
   "information-on-rat-husbandry": "Information",
   "basic-rat-info": "Basic Rat Information",
@@ -20,7 +21,6 @@
   "the-vdrd": "VdRD r.V.",
   "imprint": "Imprint",
   "source-code": "Source Code",
-  "give-feedback": "Give Feedback",
   "feedback": "Feedback",
   "sus-title": "Rate the calculator",
   "explanation-feedback": "Thank you for giving us feedback! We will use your feedback to improve the calculator.",