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/Config.md

@@ -306,7 +306,8 @@ git:
   # Command used when displaying the current branch git log in the main window
   branchLogCmd: git log --graph --color=always --abbrev-commit --decorate --date=relative --pretty=medium {{branchName}} --
 
-  # Command used to display git log of all branches in the main window
+  # Command used to display git log of all branches in the main window.
+  # Deprecated: User `allBranchesLogCmds` instead.
   allBranchesLogCmd: git log --graph --all --color=always --abbrev-commit --decorate --date=relative  --pretty=medium
 
   # If true, do not spawn a separate process when using GPG

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