T17732 / Enable "\;" to escape property values in record-type

The record-type uses `;` as delimiter, if used as part of the property value
then it needs to be escaped by the `\;` notation.

[0] https://phabricator.wikimedia.org/T17732
Merge pull request #664 from SemanticMediaWiki/record-escape-semicolon

T17732 / Enable "\;" to escape property values in record-type