enhance: improve commit page header (#39229)

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

services/asymkey/commit.go

@@ -46,7 +46,7 @@ func ParseCommitWithSignatureCommitter(ctx context.Context, c *git.Commit, commi
 		return &asymkey_model.CommitVerification{
 			CommittingUser: committer,
 			Verified:       false,
-			Reason:         "gpg.error.not_signed_commit",
+			Reason:         asymkey_model.VerificationReasonCommitNotSigned,
 		}
 	}
 	// to support instance key, we need a fake committer user (not really needed, but legacy code accesses the committer without nil-check)

services/repository/files/commit.go

@@ -6,6 +6,7 @@ package files
 import (
 	"context"
 
+	"gitea.dev/models/asymkey"
 	"gitea.dev/modules/git"
 	"gitea.dev/modules/structs"
 	asymkey_service "gitea.dev/services/asymkey"
@@ -28,7 +29,7 @@ func GetPayloadCommitVerification(ctx context.Context, commit *git.Commit) *stru
 	verification.Verified = commitVerification.Verified
 	verification.Reason = commitVerification.Reason
 	if verification.Reason == "" && !verification.Verified {
-		verification.Reason = "gpg.error.not_signed_commit"
+		verification.Reason = asymkey.VerificationReasonCommitNotSigned
 	}
 	return verification
 }