Containment: Rename panel edit action to "Enter Edit Mode"

This action doesn't just let you edit the panel; it also enters the
global edit mode. So let's update the text to reflect that.
1 job for !334 with better-edit-text in 42 seconds (queued for 191 minutes and 3 seconds)
latest detached
Status Name Job ID Coverage
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failed suse_tumbleweed_qt515 #132119
Linux

00:00:42

 
Name Stage Failure
failed
suse_tumbleweed_qt515 Build
WARNING: JUnitTestResults.xml: no matching files   
ERROR: No files to upload
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WARNING: cppcheck.json: no matching files
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Cleaning up file based variables
ERROR: Job failed: exit code 1