fix(backend)rename error code

backend/handlers/user_handler.go

@@ -21,7 +21,7 @@ func Login(c *gin.Context) {
 	}
 
 	if err := c.ShouldBindJSON(&input); err != nil {
-		c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid input"})
+		c.JSON(http.StatusBadRequest, gin.H{"error": "Неверный ввод"})
 		return
 	}
 
@@ -32,7 +32,7 @@ func Login(c *gin.Context) {
 	passErr := bcrypt.CompareHashAndPassword([]byte(user.Password), []byte(input.Password))
 
 	if err != nil || passErr != nil {
-		c.JSON(http.StatusUnauthorized, gin.H{"error": "Invalid login or password"})
+		c.JSON(http.StatusUnauthorized, gin.H{"error": "Неверный логин или пароль"})
 		return
 	}