fixes #1588
lesson_edit_handlebars with minimal data fields necessary for editing lesson contents
if thetemplate is for lesson, hide unnecessary datum fields like gloss, syntacticTree (this is done in css)
Merge branch 'master' of github.com:OpenSourceFieldlinguistics/FieldDB

pulled from upstream
Merge pull request #1591 from hisakonog/master

language lesson edit handlebars