Test suite: failure with locale/language different from 'en'

[deining]

Checklist

• I have searched the issue tracker for open issues that relate to the same problem, before opening a new one.
• This issue only relates to a single bug. I will open new issues for any other problems.

Describe the bug

Running the test suite fails with a locale/language different from en.

How to reproduce

1. Go to root of repo
2. Switch to folder dialog (or widget or ...)
3. Switch to a language different from en:

cd dialog && export LANG=es_ES.utf8 && go test ./...

4. Run the test suite:

go test ./...

You will now see errors:

...
    folder_test.go:38: 
        	Error Trace:	/home/user_x/fyne/dialog/folder_test.go:38
        	Error:      	Not equal: 
        	            	expected: "Open Folder"
        	            	actual  : "Abrir Carpeta"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1 +1 @@
        	            	-Open Folder
        	            	+Abrir Carpeta
        	Test:       	TestShowFolderOpen
    folder_test.go:49: 
        	Error Trace:	/home/user_x/fyne/dialog/folder_test.go:49
        	Error:      	Not equal: 
        	            	expected: "(Parent)"
        	            	actual  : "(Padre)"
        	            	
        	            	Diff:
        	            	--- Expected
        	            	+++ Actual
        	            	@@ -1 +1 @@
        	            	-(Parent)
        	            	+(Padre)
        	Test:       	TestShowFolderOpen
FAIL
FAIL	fyne.io/fyne/v2/dialog	6.689s
FAIL

Screenshots

No response

Example code

From the root the repo:

export LANG=es_ES.utf8 && go test ./...

Fyne version

4a875d9

Go compiler version

gcc (Ubuntu 13.3.0-6ubuntu2~24.04) 13.3.0

Operating system and version

Ubuntu 24.04

Additional Information

No response