Twenty Fourteen: remove unneeded translator context from theme Help tab text, props domain. See #25837.

git-svn-id: https://develop.svn.wordpress.org/trunk@26190 602fd350-edb4-49c9-b593-d223f7449a82
Don't place smilies inside of pre or code tags. Don't skip smilie after a smilie with an 8 in it. Fix regular expression used for smiley translations to work when there is only one registered emoticon.

Props solarissmoke, soulseekah, mdbitz, yonasy. ht to mdbitz for the Unit Tests and a comprehensive patch.
Fixes #16448, #20124, #25303.



git-svn-id: https://develop.svn.wordpress.org/trunk@26191 602fd350-edb4-49c9-b593-d223f7449a82