Display underlined text when text is marked as <hi rend = "underline">

[federicaspinelli]

Display underlined text when text is marked as <hi rend="underline">.

[gmarozzi]

Display underlined text when text is marked as <hi rend = "underline" (as it is shown in italics when encoded <emph

[federicaspinelli]

Fixed adding a rule to evt_builder-custom-styles.css