Updated Theme Issues (markdown)

Theme-Issues.md

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 ## My theme reset to default!
+If you were using a theme other than the default light one, you'll find that your preference was reset to default due to a change in the way that Cloudlog manages themes. To switch back to another theme, click on your username at the top-right of the menu bar (next to the user icon) and select Account. On the Edit Account page, choose another theme from the Stylesheet drop-down menu.
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+The old "Dark" theme is now "Cyborg (Dark)". All other themes retained their original names. You'll see some new themes available to try as well.
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+Note: This change occurred with database migration 57.