Added a bunch of english and german translations 🌎

ref #5

src/locales/en.json

@@ -1,6 +1,16 @@
 {
-  "firstname": "firstname",
-  "lastname": "lastname",
-  "group": "group",
-  "id": "ID"
+  "firstname": "First name",
+  "lastname": "Last name",
+  "please_use_blockletters": "Please write in BLOCK LETTERS.",
+  "sponsoring_title": "Sponsoring contract",
+  "group": "Team/class",
+  "address": "Address",
+  "sponsor": "sponsor",
+  "street": "Street",
+  "house_number": "House number",
+  "postalcode": "Postal code",
+  "city": "City",
+  "location": "Location",
+  "date": "date",
+  "signature": "Signature"
 }