This problem first found on local Help desk on Thai wikipedia on 29 Jan 2021. I tried to figure out where is this come from but no luck, and I also test on English wikipedia using same method and it work just fine.

Steps to Reproduce:

1. Go to https://th.wikipedia.org/w/index.php?title=สวัสดีครับ&action=edit&uselang=th and edit using editing tool (2010 wikitext editor).
2. Click on articleRedirect button (one like this)

Actual Results:

1. It append #เปลี่ยนทาง,#REDIRECT [[ชื่อหน้าเป้าหมาย]].

Expected Results:

1. It should append #เปลี่ยนทาง [[ชื่อหน้าเป้าหมาย]] which is a localized version of #redirect [[]].

PS. Sorry for my poorly English, Please ask if something I've written isn't clear.