add api for getting total income/expense amounts by month

src/locales/en.js

@@ -564,6 +564,8 @@ export default {
         'transaction tag is in use and cannot be deleted': 'Transaction tag is in use and it cannot be deleted',
         'query items cannot be empty': 'There are no query items',
         'query items too much': 'There are too many query items',
+        'query items have invalid item': 'There is invalid item in query items',
+        'parameter invalid': 'Parameter is invalid',
     },
     'parameter': {
         'id': 'ID',

src/locales/zh_Hans.js

@@ -564,6 +564,8 @@ export default {
         'transaction tag is in use and cannot be deleted': '交易标签正在被使用，无法删除',
         'query items cannot be empty': '请求项目不能为空',
         'query items too much': '请求项目过多',
+        'query items have invalid item': '请求项目中有非法项目',
+        'parameter invalid': '参数错误',
     },
     'parameter': {
         'id': 'ID',