preparing for https://github.com/OpenSourceFieldlinguistics/FieldDB/issues/1459
making lexicon browser light so it appears better on a projector
using local copy for debugging edits
showing only one column
making the hover lexical entry light as well
lexicon browser can save edits to lexical items to the datum

this provides a user interface for lexical entry cleaning for these issues:
for https://github.com/OpenSourceFieldlinguistics/FieldDB/issues/901
for https://github.com/OpenSourceFieldlinguistics/FieldDB/issues/913
similar to https://github.com/OpenSourceFieldlinguistics/FieldDB/issues/1224
for https://github.com/OpenSourceFieldlinguistics/FieldDB/issues/1459
https://github.com/OpenSourceFieldlinguistics/FieldDB/issues/771

fixes https://github.com/OpenSourceFieldlinguistics/FieldDB/issues/1474
showing contexts always and only showing

popup if any changes were found