Fix LaTeX: :confval:release is not escaped (refs: #3362)

CHANGES

@@ -14,6 +14,7 @@ Bugs fixed
 ----------
 
 * #3370: the caption of code-block is not picked up for translation
+* LaTeX: :confval:`release` is not escaped (refs: #3362)
 
 Testing
 --------

sphinx/writers/latex.py

@@ -384,9 +384,9 @@ class LaTeXTranslator(nodes.NodeVisitor):
         self.elements.update({
             'wrapperclass': self.format_docclass(document.settings.docclass),
             # if empty, the title is set to the first section title
-            'title':        document.settings.title,
-            'release':      builder.config.release,
-            'author':       document.settings.author,
+            'title':        document.settings.title,    # treat as a raw LaTeX code
+            'release':      self.encode(builder.config.release),
+            'author':       document.settings.author,   # treat as a raw LaTeX code
             'releasename':  _('Release'),
             'indexname':    _('Index'),
         })