[uk] pdf builds are failing.

see: python/python-docs-uk#6

Author: JulienPalard

build_docs.py

@@ -297,7 +297,7 @@ class Language:
     Language("pl", "pl", "Polish", False, XELATEX_DEFAULT),
     Language("pt-br", "pt_BR", "Brazilian Portuguese", True, XELATEX_DEFAULT),
     Language("tr", "tr", "Turkish", True, XELATEX_DEFAULT),
-    Language("uk", "uk", "Ukrainian", False, XELATEX_DEFAULT),
+    Language("uk", "uk", "Ukrainian", False, XELATEX_DEFAULT, html_only=True),
     Language("zh-cn", "zh_CN", "Simplified Chinese", True, XELATEX_WITH_CJK),
     Language("zh-tw", "zh_TW", "Traditional Chinese", True, XELATEX_WITH_CJK),
 }