1. Objective

Because currently messages in the plugin kinda robot-ish, it can tell what is going on, but not enough to helping user to diagnose issues that has been raised on their screen by themselves.

For example, a payment result validation at the 3-D Secure callback function.

Order not found: Your card might be charged already.
Please contact our support team if you have any questions

This one is almost good, but can be better. 'Order not found'.
As a programmatic, it does make senses because this error will be raised if a method cannot retrieve an order object from a given order id.

But as a user, it tells nothing except something is wrong.
We can humanize it more by the following message.

We cannot validate your payment result:
Note that your payment might already has been processed.
Please contact our support team if you have any questions

2. Description of change

2.1. Enhance all messages in the plugin

2.2. Translate all of messages into JA, ID.

2.3. Add Grunt.js task. (now you can use 'grunt makepot' to build a 'pot' file.)

3. Quality assurance

• Platform version: WooCommerce v3.1.1
• PHP version: 5.6.30

✏️ Details:

It's mostly about word, sentence, message.
In order to check, you can look at https://github.com/omise/omise-woocommerce/blob/a332173499d4f098dea0cb8068366de8a5de8a57/languages/omise-ja.po

4. Impact of the change

No.

5. Priority of change

Normal

6. Additional Notes

There are some parts that haven't been translated left but it's my intention. I want to test translate with GlotPress.