BL-728 Prevent language labels from picking up italic or bold styling
BL-703: Book font is being applied to page thumbnail labels

The rules for the style div:lang(en){...} are being applied to
all divs if the html tag has a lang="en" attribute set.
Add missing "using geckofx" for mono build
Merge pull request #139 from phillip-hopper/BL-703

BL-703: Book font is being applied to page thumbnail labels
Merge pull request #138 from gmartin7/BL-728LangLabels

BL-728 Prevent language labels from picking up italic or bold styling
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