Make alert aria message translatable (#9575)

* Make alerts aria message translatable

* Update change notes

* Update change note

core/language/en-GB/Misc.multids

@@ -1,5 +1,6 @@
 title: $:/language/
 
+Alerts: Alerts
 AboveStory/ClassicPlugin/Warning: It looks like you are trying to load a plugin designed for ~TiddlyWiki Classic. Please note that [[these plugins do not work with TiddlyWiki version 5.x.x|https://tiddlywiki.com/#TiddlyWikiClassic]]. ~TiddlyWiki Classic plugins detected:
 BinaryWarning/Prompt: This tiddler contains binary data
 ClassicWarning/Hint: This tiddler is written in TiddlyWiki Classic wiki text format, which is not fully compatible with TiddlyWiki version 5. See https://tiddlywiki.com/static/Upgrading.html for more details.

core/ui/PageTemplate/alerts.tid

@@ -1,7 +1,7 @@
 title: $:/core/ui/PageTemplate/alerts
 tags: $:/tags/PageTemplate
 
-<div class="tc-alerts" role="region" aria-label="Alerts">
+<div class="tc-alerts" role="region" aria-label={{$:/language/Alerts}}>
 
 <$list filter="[all[shadows+tiddlers]tag[$:/tags/Alert]!is[draft]]" template="$:/core/ui/AlertTemplate" storyview="pop"/>
 

editions/tw5.com/tiddlers/releasenotes/5.4.0/improve-alert-a11y.tid

@@ -0,0 +1,10 @@
+title: $:/changenotes/5.4.0/#9248
+description: Improve alert accessibility
+release: 5.4.0
+tags: $:/tags/ChangeNote
+change-type: enhancement
+change-category: usability
+github-links: https://github.com/TiddlyWiki/TiddlyWiki5/pull/9248 https://github.com/TiddlyWiki/TiddlyWiki5/pull/9575
+github-contributors: Leilei332
+
+