Fix placeholder case

Author: rolandgeider

lib/l10n/app_ta.arb

@@ -3,7 +3,7 @@
   "@userProfile": {},
   "weightUnit": "எடை அலகு",
   "@weightUnit": {},
-  "setNr": "{Nr} அமைக்கவும்",
+  "setNr": "{nr} அமைக்கவும்",
   "@setNr": {
     "description": "Header in form indicating the number of the current set. Can also be translated as something like 'Set Nr. xy'.",
     "type": "text",