fix(files): Remove confusing table header labels

For screen readers the table header was very verbose and confusing,
as the SR reads out e.g. "sort list by name button FILENAME" for every row / file.
Instead reduce it to "name button FILENAME" and add information about sorting to caption, as recommended by WCAG [1]

[1]: https://www.w3.org/WAI/ARIA/apg/patterns/table/examples/sortable-table/

Signed-off-by: Ferdinand Thiessen <opensource@fthiessen.de>

apps/files/src/components/FilesListTableHeaderButton.vue

@@ -25,7 +25,6 @@
 			'files-list__column-sort-button--active': sortingMode === mode,
 			'files-list__column-sort-button--size': sortingMode === 'size',
 		}]"
-		:aria-label="sortAriaLabel"
 		:alignment="mode === 'size' ? 'end' : 'start-reverse'"
 		type="tertiary"
 		@click="toggleSortBy(mode)">
@@ -71,13 +70,6 @@ export default defineComponent({
 		},
 	},
 
-	computed: {
-		sortAriaLabel() {
-			return this.t('files', 'Sort list by {column}', {
-				column: this.name,
-			})
-		},
-	},
 	methods: {
 		t: translate,
 	},

apps/files/src/components/FilesListVirtual.vue

@@ -182,8 +182,9 @@ export default defineComponent({
 		caption() {
 			const defaultCaption = t('files', 'List of files and folders.')
 			const viewCaption = this.currentView.caption || defaultCaption
+			const sortableCaption = t('files', 'Column headers with buttons are sortable.')
 			const virtualListNote = t('files', 'This list is not fully rendered for performance reasons. The files will be rendered as you navigate through the list.')
-			return viewCaption + '\n' + virtualListNote
+			return `${viewCaption}\n${sortableCaption}\n${virtualListNote}`
 		},
 	},