LOC-26 Strings: integrate English edits from docs team

@anamartinez @ydrain @jwswj @maximeprades @chnorton 

Note: I had to make a change to a key (and I could not decipher how to update the code that references it):

"text.integrations.magento.config.test_connection" => "text.integrations.magento.config.test_connection.title"

to avoid the leaf/node problem.  You cannot have a key that is prefix of another key.

In this case, "text.integrations.magento.config.test_connection" is a prefix of "text.integrations.magento.config.test_connection.inbound.success"