Merge 112539 - Web Inspector: "go to the previous panel" shortcut is painful to maintain

Merge 112539 - Web Inspector: "go to the previous panel" shortcut is painful to maintain
https://bugs.webkit.org/show_bug.cgi?id=82602

Reviewed by Vsevolod Vlasov.

Present go to previous panel shortcut "Cmd - Left" is painful to support since we have
more and more free flow editing capabilities (where Cmd - Left is handled by the editor).
Remaping it to Cmd - Option - [ (]) /  (Ctrl - Alt - [ (]) ).

Drive-by: de-capitalize captions from the settings panel.

* English.lproj/localizedStrings.js:
* inspector/front-end/ConsoleView.js:
(WebInspector.ConsoleView.prototype._registerShortcuts):
* inspector/front-end/InspectorView.js:
(WebInspector.InspectorView.prototype._keyDown):
* inspector/front-end/ScriptsPanel.js:
* inspector/front-end/TimelinePanel.js:
(WebInspector.TimelinePanel.prototype._registerShortcuts):
(WebInspector.TimelinePanel.prototype._contextMenu):
* inspector/front-end/inspector.js:
(WebInspector._registerShortcuts):

TBR=pfeldman@chromium.org
BUGS=112539
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=112844