LOC-26 Strings: integrate English edits from docs team

@anamartinez @ydrain @maximeprades @chnorton @jwswj 

These analogous changes need to be made elsewhere in the magento_extension project, especially the key change for "text.integrations.magento.config.test_connection.title".  Please make these changes soon, so that our next sweep will be clean.  thx in advance