removed unused messages

messages/en.json

@@ -5,8 +5,7 @@
   "account-page": {
     "title": "User account",
     "settings-button": "User Settings",
-    "logout-button": "Logout",
-    "logging-out-message": "Logging out..."
+    "logout-button": "Logout"
   },
   "PageFooter": {
     "app-description": "Helping you to stay on top of your utility bills",

messages/hr.json

@@ -5,8 +5,7 @@
   "account-page": {
     "title": "Korisnički račun",
     "settings-button": "Korisničke postavke",
-    "logout-button": "Odjava",
-    "logging-out-message": "Odjavljujem se..."
+    "logout-button": "Odjava"
   },
   "PageFooter": {
     "app-description": "Preuzmite kontrolu nad svojim režijama!",