don't allow adding balance modification transaction when account already has other transaction

src/locales/en.js

@@ -314,6 +314,7 @@ export default {
         'too much transaction in one second': 'There are too much transaction in one second, please choose another time',
         'balance modification transaction cannot set category': 'You cannot set category for balance modification transaction',
         'balance modification transaction cannot change account id': 'You cannot change account ID for balance modification transaction',
+        'balance modification transaction cannot add when other transaction exists': 'You cannot add balance modification transaction when other transaction already exists in this account',
         'transaction category id is invalid': 'Transaction category ID is invalid',
         'transaction category not found': 'Transaction category is not found',
         'transaction category type is invalid': 'Transaction category type is invalid',

src/locales/zh_Hans.js

@@ -314,6 +314,7 @@ export default {
         'too much transaction in one second': '一秒钟内交易太多，请选择其他时间',
         'balance modification transaction cannot set category': '您无法对修改余额的交易设置分类',
         'balance modification transaction cannot change account id': '您无法对修改余额的交易修改账户ID',
+        'balance modification transaction cannot add when other transaction exists': '您不能在该账户已经存在其他交易时添加余额修改交易',
         'transaction category id is invalid': '交易分类ID无效',
         'transaction category not found': '交易分类不存在',
         'transaction category type is invalid': '交易分类类型无效',