Translate into Khmer language
Merge pull request #3224 from Chanthoeun/2.3/develop

Translate into Khmer language
Merge branch 'refs/heads/2.3/develop' into 3.0/develop

Conflicts:
	system/cms/modules/addons/details.php
	system/cms/modules/blog/details.php
	system/cms/modules/navigation/details.php
	system/cms/modules/redirects/details.php
	system/cms/modules/templates/details.php