Update 09/26/19
Updated for 6.1 patch!

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UPDATE:

Hello, humans! As has surely become apparent, I have been away from this game for most of this year.  However, I recently had a reason to return and I've updated this mod as usual.

I cannot guarantee persistent interest in this game, but this is a very simple mod, and you can do it yourself! Here is a basic step-by-step:

• Download the GMD Editing Tool by FusionR and the Chunk extraction tool by MHVuze. The former can be run wherever, but the latter should be installed to .../Steam/steamapps/common/Monster Hunter World/chunk.
• Drag and drop the most recent chunk.bin containing .../common/text/cm_chat_eng.gmd into WorldChunkTool.exe. Which chunk is the most recent one takes some guess work. The correct chunk for 6.1 is chunk10.bin. Whenver this mod breaks again, it will be a new chunk that is not present in the game files currently.
• It may be prudent to move the extracted chunk folder out of the game's files, as they can be quite large. Consider deleting it when you are finished. The chunk#.pkg and chunk#.csv files are generated by the tool and can also be deleted once they are extracted.
• Once you have verified it is the right chunk, run the Cirilla toolkit. Select "Open" and navigate to .../chunk10/common/text/cm_chat_eng.gmd.
• Click on the Entries tab once opened, and type Slayed! into the textbox to locate the correct index in the table.
• Double click where it reads Slayed! to edit it to whatever you want. (Suggestion: Slain!)
• Save. If you want to make sure it went correctly, repeat steps 4-6, but search for "Slain" instead. If it shows up and Slayed doesn't , then you did it right.
• Drop the finished cm_chat_eng.gmd into ...Steam/steamapps/common/Monster Hunter World/nativePC/common/text/ just like you would with any other mod.
• Run a test in-game to make sure everything was done correctly. You should not get janky messages on the sides when you first log into Astera, and doing a Barroth quest (or any other easy to clear monster killing quest) should correctly read "Slain!"
  

It's been a joy to fix minor nitpicks in the game and I will continue to do so when I'm able, but now you can enjoy proper grammar while I am not around! Hooray!

Thank you for using my mod!
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This is a simple text mod that changes the chat prompt for slaying a monster from "Slayed!" to "Slain!"

The grammatical form "slayed" doesn't make much sense for how it's being used in the context of this prompt. In addition, "slayed" specifically has use meaning something a performer does to a crowd. This sounds silly when used to refer to literally slaying a monster.

Only compatible with the English version.

To Install:
Simply extract the archive into the MONSTER HUNTER WORLD directory.

To Uninstall:
Delete or rename the file path ".../nativePC/common/text/cm_chat_eng.gmd"



Credits:
MHVuze - Chunk extraction tool
FusionR - GMD editing tool