i18n tools: Have makepot search for the main file of the plugin.

props Otto42.
fixes #25665.


git-svn-id: https://develop.svn.wordpress.org/trunk@27399 602fd350-edb4-49c9-b593-d223f7449a82
Use esc_attr_e() instead of _e() for attribute values.

props DJPaul.
fixes #27274.

git-svn-id: https://develop.svn.wordpress.org/trunk@27400 602fd350-edb4-49c9-b593-d223f7449a82