The legend of heroes tag is already part of the "loh" part of the individual games that have tags on them. There is no need for it.
For now, the tags have been merged.
There were only two questions using the-legend-of-heroes and both were about Trails in the Sky, so I've gone ahead and merged them to loh-trails-in-the-sky. However, given that 'Legend of Heroes' could refer to any of the LoH games in the series I opted not to create a synonym today.