Allow cycling between multiple log commands

- Introduced a new optional user config command, allBranchesLogCmds
- When pressing 'a' in the Status view, cycle between non-empty, non-identical log commands
- There will always be at least one command to run, since allBranhesLogCmd has a default
- Update documentation & write an integration test
- Update translation string

docs/keybindings/Keybindings_en.md

@@ -309,7 +309,7 @@ If you would instead like to start an interactive rebase from the selected commi
 | `` e `` | Edit config file | Open file in external editor. |
 | `` u `` | Check for update |  |
 | `` <enter> `` | Switch to a recent repo |  |
-| `` a `` | Show all branch logs |  |
+| `` a `` | Show/cycle all branch logs |  |
 
 ## Sub-commits