"How can i assist" not translated in the Assist language

[FabienD74]

Checklist

• I have updated to the latest available Home Assistant version.
• I have cleared the cache of my browser.
• I have tried a different browser to see if it is related to my browser.
• I have tried reproducing the issue in safe mode to rule out problems with unsupported custom resources.

Describe the issue you are experiencing

Hi.
The welcome message "How can i assist" not translated in the right language.
is translated:
-> in the language defined in HA user setting, when using Chrome on PC.
-> In the android OS setting on smarthphone

Describe the behavior you expected

The welcome message "How can i assist" is translated:
-> in the language defined in HA user setting, when using Chrome on PC.
-> In the android OS setting on smarthphone
This is already inconsistent( 2 differents behaviours) , ... BUT ...

"How can i assist" should be translated in the language defined in Assist.
Example if my android is in FR, and my user settings in HA is EN:
=> on PC i have the message "How an i assist"
=> on android i have "Comment puis-je vous aider"
=>If i have selected "Dutch" as the language in Assist, it doesn't make sense to have it in EN in Chrome on my PC, and in FR on Android, .... it should be in Dutch on all platforms...;-) :-)

Issue was already reported here: #17106
Regards

Steps to reproduce the issue

1. Define language in HA user settings which is not the language of your android OS.
2. Chose a third language in the Assist settings.
3. run Assist on all platforms. It should be language(2)
   ...

What version of Home Assistant Core has the issue?

core-2025.3.1

What was the last working version of Home Assistant Core?

No response

In which browser are you experiencing the issue?

No response

Which operating system are you using to run this browser?

No response

State of relevant entities

Problem-relevant frontend configuration

Javascript errors shown in your browser console/inspector

Additional information

No response