Sort keys are most often not defined as linguisitic terms, but as abbreviation with possibly modified oethographies. In addition then may often be limtied to a space or may start by a space. These keys shuold be visualized between alternate quotation marks (without inner spaces).
Please change:
* "Sort key changed from $1 to $2" to "Sort key changed from ‹$1› to ‹$2›"
* "Sort key set to $1" to "Sort key set to ‹$1›"
* "Sort key unset from $1" to "Sort key unset from ‹$1›"
Otherwise, the sort keys are not easily to see clearly in messages to exhibit the diffrences.
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**Message URL**:
* https://translatewiki.net/w/i.php?title=Special:Translate&showMessage=visualeditor-changedesc-mwcategory-sortkey-changed&group=ext-visualeditor-ve-mw&language=en
* https://translatewiki.net/w/i.php?title=Special:Translate&showMessage=visualeditor-changedesc-mwcategory-sortkey-set&group=ext-visualeditor-ve-mw&language=en
* https://translatewiki.net/w/i.php?title=Special:Translate&showMessage=visualeditor-changedesc-mwcategory-sortkey-unset&group=ext-visualeditor-ve-mw&language=en