[Inconsistent spelling] "file name" or "filename(s)" - which one is it? Without space or with space?

Version information

• Thunar 4.20.7
• openSUSE Tumbleweed snapshot 20260303

Steps to reproduce

1. create a new file or rename an existing file
2. type a file name nothing but / and note the warning message below the text box
3. replace the typed file name with nothing but (a space) and note the warning message below the text box

Expected outcome

The warning note should use the same spelling for file name/filename(s) whether that be without a space or with a space - just not both!

Screenshots