Increase size of the language column in language_stat (#12396)

In #12379 it was discovered that enry v2 has a maximum language length
of 34 characters which is larger than the 30 previously provided.

This PR updates the language column to 50.

Fix #12379

models/migrations/migrations.go

@@ -222,6 +222,8 @@ var migrations = []Migration{
 	NewMigration("recalculate Stars number for all user", recalculateStars),
 	// v144 -> v145
 	NewMigration("update Matrix Webhook http method to 'PUT'", updateMatrixWebhookHTTPMethod),
+	// v145 -> v146
+	NewMigration("Increase Language field to 50 in LanguageStats", increaseLanguageField),
 }
 
 // GetCurrentDBVersion returns the current db version
@@ -464,7 +466,6 @@ func dropTableColumns(sess *xorm.Session, tableName string, columnNames ...strin
 			sess.Rollback()
 			return fmt.Errorf("Drop table `%s` columns %v: %v", tableName, columnNames, err)
 		}
-
 		return sess.Commit()
 	default:
 		log.Fatal("Unrecognized DB")