PLT-5571: Updated error messages related to url length, start, end and adjacent underscores (#5550)

webapp/i18n/en.json

@@ -1052,11 +1052,11 @@
   "calling_screen": "Calling",
   "center_panel.recent": "Click here to jump to recent messages. ",
   "change_url.close": "Close",
-  "change_url.endWithLetter": "Must end with a letter or number",
+  "change_url.endWithLetter": "URL must end with a letter or number.",
   "change_url.invalidUrl": "Invalid URL",
-  "change_url.longer": "Must be longer than two characters",
-  "change_url.noUnderscore": "Can not contain two underscores in a row.",
-  "change_url.startWithLetter": "Must start with a letter or number",
+  "change_url.longer": "URL must be two or more characters.",
+  "change_url.noUnderscore": "URL can not contain two underscores in a row.",
+  "change_url.startWithLetter": "URL must start with a letter or number.",
   "channelHeader.addToFavorites": "Add to Favorites",
   "channelHeader.removeFromFavorites": "Remove from Favorites",
   "channel_flow.alreadyExist": "A channel with that URL already exists",