String tweaks:
* Empty pane message: say "pane" instead of "view", and say "open" instead
of "select" (to reduce the confusion in #9254)
* JS File Inference Problem dialog: ask users to file a Brackets bug; fix
capitalization; format more like other errors that call out a filename.
* Remove unused UNSUPPORTED_FILETYPE error & its corresponding string (I
think this was leftover from an earlier part of splitview)
Update Galician lang
Revert to the previous selection in the file tree if there's an error.

Fix for #9313.
Fix for #9328.
Kept jstree rename input text from shifting and tweaked unfocused pane header text color on light UI.
Trigger for shadow on file tree to move when working set changes.

This restores the same handling that was in ProjectManager previously.

This is a fix for #9358.
Merge pull request #9297 from ivarcia/master

Update Galician lang
Code review: Update link in JS code hints error dialog
Merge pull request #9280 from adobe/pflynn/string-tweaks

String tweaks
Merge pull request #9360 from adobe/dangoor/9358-tree-shadow-alignment

Trigger for shadow on file tree to move when working set changes.
Merge pull request #9317 from adobe/dangoor/9313-binary-file

Revert to the previous selection in the file tree if there's an error.
Merge pull request #9361 from adobe/larz/issue-9328

UI Fixes
- fix the position of the selection div when entering rename mode
implement working set dragging for splitview
final wsv drag cleanup
Merge pull request #9369 from adobe/ingo/fix-rename-selection-div-move

fix the position of the selection div when entering rename mode
fix typos
Merge pull request #9373 from adobe/jeff/wsv-drag-final

Working Set Draggable