Add an alternate keybinding (default <c-s>) for ConfirmInEditor

[stefanhaller]

• PR Description

The default binding for ConfirmInEditor is , which has two problems:

• some terminal emulators don't support it, including the default terminal on Mac (Terminal.app)
• on Windows it is bound to toggling full-screen

Ideally we would use <c-enter> instead (and Command-Enter on Mac), but neither is possible without gdamore/tcell#671, so for the time being add an alternate keybinding which works everywhere.

Show both bindings in the footer of the commit description panel if they are both non-null. While we're at it, fix the footer for the case where either or both of the keybindings are set to <disabled>.

And finally, change "commit" to "submit" in that footer; we use the same panel also for creating tags, in which case "commit" is not quite right.

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
Report missing for 66caa251	✅ 70.37%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (66caa25)	Report Missing	Report Missing	Report Missing
Head commit (2b22ad1)	55986	48578	86.77%

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#4532)	27	19	70.37%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

See your quality gate settings    Change summary preferences

Footnotes

1. Codacy didn't receive coverage data for the commit, or there was an error processing the received data. Check your integration for errors and validate that your coverage setup is correct. ↩