[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/channels/app/users/password.go

@@ -20,16 +20,6 @@ func CheckUserPassword(user *model.User, password string) error {
 	return nil
 }
 
-// HashPassword generates a hash using the bcrypt.GenerateFromPassword
-func HashPassword(password string) string {
-	hash, err := bcrypt.GenerateFromPassword([]byte(password), 10)
-	if err != nil {
-		panic(err)
-	}
-
-	return string(hash)
-}
-
 func ComparePassword(hash string, password string) error {
 	if password == "" || hash == "" {
 		return errors.New("empty password or hash")

server/channels/app/users/password_test.go

@@ -13,13 +13,6 @@ import (
 	"github.com/mattermost/mattermost/server/public/model"
 )
 
-func TestComparePassword(t *testing.T) {
-	hash := HashPassword("Test")
-
-	assert.NoError(t, ComparePassword(hash, "Test"), "Passwords don't match")
-	assert.Error(t, ComparePassword(hash, "Test2"), "Passwords should not have matched")
-}
-
 func TestIsPasswordValidWithSettings(t *testing.T) {
 	for name, tc := range map[string]struct {
 		Password      string