Added Serbian translation
First try to fix adobe/brackets#5537
Working fix for adobe/brackets#5537
Removed debug code
Allow installing older version of an extension if the latest version is
not compatible
- Disable Update button when latest update available isn't compatible with
Brackets (previously was erroneously left enabled in Installed tab).
- Clarify in _renderItem() when button is disabled (making it more obvious
that its tooltip string is always correct).
- Make it more clear that flags like 'context.isCompatible' are specifically
referring to the latest version available, not the currently installed
version.
Merge branch 'pflynn/strings-latest-compatible-ext' into pflynn/latest-compatible-ext

Conflicts:
	src/nls/root/strings.js
- Update Extension Manager UI to use new warning string
- Add more unit tests for Extension Manager install/update button state &
ExtensionManager.getCompatibilityInfo() utility
- Fix crash when calling getCompatibilityInfo() directly on an installInfo
(instead of registryInfo) - though I think this now only happens in unit
tests
- Ensure getCompatibilityInfo() never returns isLatestVersion unless
isCompatabile is true
Corrected typo mistakes as suggested by frennky.
Updated Serbian localization.
Included Serbian language under 'Debug > Switch Language' option.
Corrected Serbian language entry in sv/strings.js
Remove check for subtree modification, since it can fire erroneously when $.find() is called
Merge pull request #5674 from adobe/nj/fix-test-failure

Remove check for subtree modification, since it can fire erroneously when $.find() is called
Spanish strings for sprint 33
Update Spanish Getting Started to sprint 33
Merge pull request #5547 from SAPlayer/find-index-no-open-file

Fix #5537: Start live development even if there is no open file
Review fixes for spanish strings sprint 33
Update LIVE_DEV_NEED_HTML_MESSAGE Spanish translation
Merge pull request #5676 from adobe/jbalsas/spanish_sprint33

Spanish strings for Sprint 33