Improve the error message when users have gpg signing turned on

It is not obvious that you can get rid of the error by using the overrideGpg
config, so tell them.

Author: stefanhaller

pkg/i18n/english.go

@@ -1438,7 +1438,7 @@ func EnglishTranslationSet() *TranslationSet {
 		DiscardOldFileChangeTooltip:          "Discard this commit's changes to this file. This runs an interactive rebase in the background, so you may get a merge conflict if a later commit also changes this file.",
 		DiscardFileChangesTitle:              "Discard file changes",
 		DiscardFileChangesPrompt:             "Are you sure you want to remove changes to the selected file(s) from this commit?\n\nThis action will start a rebase, reverting these file changes. Be aware that if subsequent commits depend on these changes, you may need to resolve conflicts.\nNote: This will also reset any active custom patches.",
-		DisabledForGPG:                       "Feature not available for users using GPG",
+		DisabledForGPG:                       "Feature not available for users using GPG.\n\nIf you are using a passphrase agent (e.g. gpg-agent) so that you don't have to type your passphrase when signing, you can enable this feature by adding\n\ngit:\n  overrideGpg: true\n\nto your lazygit config file.",
 		CreateRepo:                           "Not in a git repository. Create a new git repository? (y/n): ",
 		BareRepo:                             "You've attempted to open Lazygit in a bare repo but Lazygit does not yet support bare repos. Open most recent repo? (y/n) ",
 		InitialBranch:                        "Branch name? (leave empty for git's default): ",