Tag Implication: half-life_2 -> half-life

Implicating half-life_2 -> half-life.

Reason: specific game(s) to series

There aren't any posts that directly reference the first Half-Life game, so this implication seems more academic than actually useful.

What I meant by "game(s)" was the multiple "Half-Life 2" games, such as the Episodes.

Since it seems people have tagged images according to the second parts of the franchise, it'd be good to have the franchise tag as an implication, no?

Done.