[Support request] Japanese translations of the form and login message aren't reflected

Hi all,

I’m trying to translate the form and login message to Japanese. I have updated the simple-membership-ja.po file, but the form and messages are still displayed in English.

What I did
I have updated the simple-membership-ja.po file using Loco Translate Plugin. The file is correctly updated.
<a href=”https://drive.google.com/file/d/1Azdx74XPj94rjgjkSyYop8sB5rNP_mOJ/view“>ScreenShot

What’s happening
However, the interface is still in English.
<a href=”https://drive.google.com/file/d/1xUHOQ6uVzFZzKWWo_Rsi_0ikL5huLL-G/view?usp=sharing“>screen shot of the form
<a href=”https://drive.google.com/file/d/106_kwccTkF2qdMuddfyOXoDk48sZJPcZ/view?usp=sharing“>screen shot of login message

What I tried
Relocated the file to languages/plugins/simple-membership-ja.po, but nothing happened.
Removed cache and cookie.
Confirmed the WordPress language setting is in Japanese
<a href=”https://drive.google.com/file/d/170z2fQd_AmYuTZYk2P2FYAhs7uHsGrNe/view?usp=sharing“>screen shot of language setting
Synced the simple-membership-ja.po file to reflect the latest simple-membership.pot file updates.
Confirmed that some internal interface was translated to Japanese, but updating the simple-membership-ja.po file doesn’t change internal interface translation as well.
<a href=”https://drive.google.com/file/d/1-UZasnx3Q2GtYCykZyBiuvZV2gyWUV6u/view?usp=sharing“>screen shot of the Japanese interface

Best regards,
Ryo