Refactor show_editable_model. Add show_editable_model_icon that adds an icon attached to model editing.
CSS edit for show_editable_model_icon
Fix js Style
Refactor and rename show_editable_model. Add other render_model* templatetags.
Update tests. Add tests for new render_model templatetags
Coverage improvement
Fix url
Cleanup
Update documentation for render_model templatetags
Use custom (overridable) icons for render_model_icon and render_model_add
Use a transparent placeholder and CSS background for render_model_icon and _add.
Documentation update for render_model templatetags
Minor render_model templatetags cleanup
Improve render_model templatetags tests
Fix test
Merge pull request #2475 from yakky/feature/show_edit_model_icon

Refactor `show_edit_model` templatetag
Merge branch 'develop' into language_publish3