verify whether required items is valid before submitting new transaction

src/locales/en.json

@@ -1400,6 +1400,10 @@
     "Please refresh the page and try again. If the error persists, ensure that the server's map settings are correctly configured.": "Please refresh the page and try again. If the error persists, ensure that the server's map settings are correctly configured.",
     "Tags": "Tags",
     "Your transaction description (optional)": "Your transaction description (optional)",
+    "Transaction category cannot be blank": "Transaction category cannot be blank",
+    "Transaction account cannot be blank": "Transaction account cannot be blank",
+    "Source account cannot be blank": "Source account cannot be blank",
+    "Destination account cannot be blank": "Destination account cannot be blank",
     "Are you sure you want to save this transaction with a zero amount?": "Are you sure you want to save this transaction with a zero amount?",
     "Unable to retrieve transaction": "Unable to retrieve transaction",
     "Unable to add transaction": "Unable to add transaction",

src/locales/zh_Hans.json

@@ -1400,6 +1400,10 @@
     "Please refresh the page and try again. If the error persists, ensure that the server's map settings are correctly configured.": "请刷新页面并重试。如果仍然显示错误，请确保正确设置了服务器地图设置。",
     "Tags": "标签",
     "Your transaction description (optional)": "你的交易描述 (可选)",
+    "Transaction category cannot be blank": "交易分类不能为空",
+    "Transaction account cannot be blank": "交易账户不能为空",
+    "Source account cannot be blank": "来源账户不能为空",
+    "Destination account cannot be blank": "目标账户不能为空",
     "Are you sure you want to save this transaction with a zero amount?": "您确定要保存这个金额为0的交易？",
     "Unable to retrieve transaction": "无法获取交易",
     "Unable to add transaction": "无法添加交易",