fixing filenames (#26231)

* fixing filenames

* building email templates

* Revert "building email templates"

This reverts commit 6aa419df3bffa666a59d60d70b1f8d00ba947531.

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Co-authored-by: Tom De Moor <tom@controlaltdieliet.be>
Co-authored-by: Mattermost Build <build@mattermost.com>

webapp/channels/src/i18n/i18n.jsx

@@ -4,7 +4,7 @@
 /* eslint-disable import/order */
 import bg from './bg.json';
 import de from './de.json';
-import enAU from './en_AU.json';
+import enAU from './en-AU.json';
 import es from './es.json';
 import fa from './fa.json';
 import fr from './fr.json';