Fix introduced typos & redundant code

There were typos introduced in the admin nag added in the last commit. And the check for Pods and Gravity Forms as well as adding the Add-On Framework is already handled in pods_gf_init.

- Also fix incorrect text domains for internationalized strings.
Merge pull request #15 from naomicbush/issue/fix-typos-redundant-code

Fix introduced typos & redundant code