Use plugins_url function to get correct url when https is being used

git-svn-id: https://plugins.svn.wordpress.org/theme-check/trunk@803286 b8457f37-d9ea-0310-8a92-e5e31aec5664
Corrected path, the plugins_url function takes the plugin directory name into account

git-svn-id: https://plugins.svn.wordpress.org/theme-check/trunk@803287 b8457f37-d9ea-0310-8a92-e5e31aec5664
First pass at fixing the I18N support for theme-check. Changed domain to "theme-check" instead of "themecheck". Some text changes. More changes will be forthcoming. This will break current translations, so do not release until complete.

git-svn-id: https://plugins.svn.wordpress.org/theme-check/trunk@803387 b8457f37-d9ea-0310-8a92-e5e31aec5664
More I18N fixes (this will take a while)

git-svn-id: https://plugins.svn.wordpress.org/theme-check/trunk@803399 b8457f37-d9ea-0310-8a92-e5e31aec5664
fix broken tc_grep function to not return endless warnings

git-svn-id: https://plugins.svn.wordpress.org/theme-check/trunk@803401 b8457f37-d9ea-0310-8a92-e5e31aec5664