feat: Add basic translation framework

public/lang/de.json

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+{
+  "back-to-home": "Zurück zur Homepage",
+  "app-name": "Käfigrechner",
+  "number-of-rats": "Anzahl an Ratten",
+  "full-floors": "Vollebenen",
+  "width-cm": "Breite (cm)",
+  "depth-cm": "Tiefe (cm)",
+  "height-cm": "Höhe (cm)",
+  "full-floors-tooltip": "Als Vollebenen zählen alle Ebenen die größer als 0.5m² sind, inklusive des Käfigbodens."
+}

public/lang/en.json

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+{
+  "back-to-home": "Back to home",
+  "app-name": "Cage Calculator",
+  "number-of-rats": "Number of Rats",
+  "full-floors": "Full floors",
+  "width-cm": "Width (cm)",
+  "depth-cm": "Depth (cm)",
+  "height-cm": "Height (cm)",
+  "full-floors-tooltip": "A full floor is each floor with a area greater than 0.5m², including the bottom of the cage."
+}