Style and accessibility improvements

Related to #531 (closed)

• Replace <h3> and <h4> in bento results with <h1> and <h2>, so heading order is logical (accessibility)
• Fix "side-scrolling" issue in Safari and possibly other non-Chrome browsers
• Restore "Trade Publications" to the Scholarly Articles bento
• Add moving-gradient loading indicator to the more results modal
• Don't show publisher in Journals bento if it's just "Unspecified"
• More robust logic for detecting publication titles that are redundant with the items title. (This mostly affects scholarly articles. Usually the publication title is the journal name and the item title is the article name, but if the item isn't from a journal, you might end up with an item title like "Time. [electronic resource] : limits and constraints." and a publication title like "Time [electronic resource] : limits and constraints / edited by Jo Alyson Parker, Paul A. Harris, and Christian Steineck." (That example is a conference proceeding, published in ebook form.))
• Tour: scroll to tooltip (instead of trying to vertically center the element, possibly at the expense of showing the tooltip).
• Truncate database title and description using the same rules as for EDS item titles and abstracts
• Exclude <ephtml> and <table> elements from encyclopedia blurb (fixes issue seen in entry for "Mars")