[MM-57942] Fix a panic on password is too long (#27449)

* return error from bcrypt, handle gracefully; remove dead code

* linting

* linting

* i18n

* fix test

* fill out translations

server/i18n/en.json

@@ -4146,6 +4146,10 @@
     "id": "api.user.update_password.oauth.app_error",
     "translation": "Update password failed because the user is logged in through an OAuth service."
   },
+  {
+    "id": "api.user.update_password.password_hash.app_error",
+    "translation": "There was an internal error saving the password."
+  },
   {
     "id": "api.user.update_password.user_and_hashed.app_error",
     "translation": "Only system administrators can set already-hashed passwords."
@@ -9758,6 +9762,14 @@
     "id": "model.user.is_valid.username.app_error",
     "translation": "Username must begin with a letter, and contain between 3 to 22 lowercase characters made up of numbers, letters, and the symbols \".\", \"-\", and \"_\"."
   },
+  {
+    "id": "model.user.pre_save.password_hash.app_error",
+    "translation": "There was an internal error saving the password."
+  },
+  {
+    "id": "model.user.pre_save.password_too_long.app_error",
+    "translation": "Your password must contain no more than 72 characters."
+  },
   {
     "id": "model.user_access_token.is_valid.description.app_error",
     "translation": "Invalid description, must be 255 or less characters."