Bug 53288: Use more descriptive link titles for read/edit in dropdowns

The read/edit buttons in the metadata and chapterlist dropdowns
were lacking 'title' properties, which meant that there was no
real description of what they did.

Bug: 53288
Change-Id: I847e23f8765cec6e6f7c7982508586d20a6c7c64
Merge "Bug 53288: Use more descriptive link titles for read/edit in dropdowns"