Core/Scripts: The Endless Hunger & Death's Challenge, creature text

This PR solves the following say text issues:
In quest ID 12733, Death's Challenge, the creature script npc_death_knight_initiate is supposed to target the player and refer to the player character's name in the following 2 lines from `creature_text`.`entry` 28406:

- "You don't stand a chance, $n." (`BroadcastTextId` 29267)
- "Remember this day, $n, for it is the day that you will be thoroughly owned." (`BroadcastTextId` 29270)

In quest ID 12848, The Endless Hunger, the creature script npc_unworthy_initiate is supposed to target the player and refer to the player character's race in the following 2 lines from `creature_text`.`entry` 29519, 29520, 29565, 29566 and 29567:

- "You are hopelessly outmatched, $r."  (`BroadcastTextId` 30212)
- "Sate your hunger on cold steel, $r!" (`BroadcastTextId` 30214)

The untargeted variables $r and $n appear in the say lines because the existing script assigns the text to the player character instead of the creatures. This does not produce any race or name information in /say or chat.

This Pull Request closes issue #14700 and replaces PR  #15678.

(cherry picked from commit 89107c3a8e61447fb6d34fd77fd454074ae5e064)

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