1. Make lwotc coil weapons colored
open the mod config file: ...Steam\steamapps\workshop\content\268500\1949328656\Config\XComGameData.ini
Add this line: +WeaponTechColor=(WeaponTechName=coilgun_lw , HexColor="213CED")
I prefer use color "213CED". If you like other then change it.


2. Make grenade launcher colored
It seems edit the translation file is the only way. Like Rusty says before.

-----GrenadeLauncher_MG edit this file-----
File (the folder and filename suffix is different by the language. choose your own):
...\Steam\steamapps\common\XCOM 2\XCom2-WarOfTheChosen\XComGame\Localization\CHN\XComGame.chn

Find: [GrenadeLauncher_MG X2GrenadeLauncherTemplate]

Add color tags like this (not add lines):
FriendlyName="<font color='#27AAE1'>高级榴弹发射器</font>"
FriendlyNamePlural="<font color='#27AAE1'>高级榴弹发射器</font>"

-----GrenadeLauncher_BM edit this file-----
File (the filename suffix is different by the language. choose your own):
...\Steam\steamapps\workshop\content\268500\2683996590\Localization\XComGame.chn

Find: [GrenadeLauncher_BM X2GrenadeLauncherTemplate]

Add color tags like this (not add lines):
FriendlyName="<font color='#9D29A3'>光束榴弹发射器</font>"
FriendlyNamePlural="<font color='#9D29A3'>光束榴弹发射器</font>"

now enjoy.