Added i18n labels for the Locales in switch language modal
English locale i18n. Got rid of the locale label string.
Do not install extensions if there exists an extension by the same name in the system default extension directory. (For example, DebugCommands or EdgeWebFonts.)
Update CodeMirror to latest SHA
Merge pull request #3753 from adobe/alf

Updated by ALF automation.
Rename systemDirectory option to systemExtensionDirectory and add JSDoc for _cmdInstall parameter.
Merge pull request #3744 from adobe/iwehrman/do-not-install-system-extensions

Don't install system extensions
Removed trailing space in strings.js file
Merge pull request #3704 from tammo/locale-description-675

Locale descriptions in switching language modal.
Updated by ALF automation.