Prevent translation string lookup from breaking on \' or \" with a negative lookbehind

Author: Anton Evers

app/code/Magento/Translation/etc/di.xml

@@ -65,7 +65,7 @@
             <argument name="patterns" xsi:type="array">
                 <item name="i18n_translation" xsi:type="string"><![CDATA[~i18n\:\s*(["'])(.*?)(?<!\\)\1~]]></item>
                 <item name="translate_wrapping" xsi:type="string"><![CDATA[~translate\=("')([^\'].*?)\'\"~]]></item>
-                <item name="mage_translation_widget" xsi:type="string"><![CDATA[~\$\.mage\.__\((?s)[^'"]*?(['"])(.+?)\1(?s).*?\)~]]></item>
+                <item name="mage_translation_widget" xsi:type="string"><![CDATA[~\$\.mage\.__\((?s)[^'"]*?(['"])(.+?)(?<!\\)\1(?s).*?\)~]]></item>
                 <item name="mage_translation_static" xsi:type="string"><![CDATA[~\$t\((?s)[^'"]*?(["'])(.+?)\1(?s).*?\)~]]></item>
             </argument>
         </arguments>