Sergey Biryukov aaf49752b2 Plugins: Move the "Successfully installed the plugin" string to the correct Plugin_Upgrader method.
The string refers to the installation, and belongs in the `::install_strings()` method, not in `::upgrade_strings()`.

Props sswebster, nateinaction, SergeyBiryukov.
Fixes #50837.
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git-svn-id: http://core.svn.wordpress.org/trunk@48496 1a063a9b-81f0-0310-95a4-ce76da25c4cd
2020-08-04 17:54:04 +00:00
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2017-11-30 23:11:00 +00:00