Translate SwordWorld, SwordWorld2.0 and SwordWorld2.5 to Simplified Chinese

[asterson]

Hello, I've added the SwordWorld、SwordWorld2.0 Simplified Chinese. I am not very familiar with GitHub, if you find any issues or have any suggestions, please let me know！

[asterson]

and also SwordWorld2.5！

[codecov]

Codecov Report

Base: 95.42% // Head: 95.43% // Increases project coverage by +0.00% 🎉

Coverage data is based on head (fce5cb1) compared to base (de9959b).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #595   +/-   ##
=======================================
  Coverage   95.42%   95.43%           
=======================================
  Files         326      329    +3     
  Lines       18401    18440   +39     
  Branches     4768     4768           
=======================================
+ Hits        17560    17599   +39     
  Misses        841      841           

Impacted Files	Coverage Δ
lib/bcdice/game_system.rb	100.00% <100.00%> (ø)
...ice/game_system/SwordWorld2_0_SimplifiedChinese.rb	100.00% <100.00%> (ø)
...ice/game_system/SwordWorld2_5_SimplifiedChinese.rb	100.00% <100.00%> (ø)
...bcdice/game_system/SwordWorld_SimplifiedChinese.rb	100.00% <100.00%> (ø)

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[ysakasin]

@asterson

Awesome!
Thank you translating.