I see that your labels include that you are using Confluence Cloud. You can add a new language file to Confluence Server very easily (by using a brush file for SyntaxHighlighter such as the one here: http://natecook.com/projects/swift-syntax-highlighting/). Clicking on Configure Code Macro under General Configuration shows a link to "Add a new language".
Unfortunately, Confluence Cloud doesn't appear to show the option to add a language. You might be able to ask Atlassian Support if they can install it for you, but no promises
As mentioned in https://jira.atlassian.com/browse/CONF-40325, we need to update Confluence versions as below
Then we don't need a fix of @Stefan Mayer-Popp.
Brush.aliases = ['swift'];
Here's the highlight sample applying to https://github.com/syntaxhighlighter/brush-swift/blob/v4.0.0/sample.txt.
Hope this helps.
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