Add main categories in the .desktop file to show it appropriately in some desktop environments.
The previous Categories=Chat; entry put electronic-wechat into Lost & Found category because it didn't specify the main category. "Chat" is an additional category.
Specifying Categories=Network;Utility;Chat; put electronic-wechat into "Internet" and "Utilities" categories in KDE Plasma.
GNOME users don't bother this because GNOME doesn't have menu categories by default. Other desktop environments are not tested.
Reference: freedesktop.org Desktop Menu Specification
My desktop environment:
Operating System: Kubuntu 18.10
KDE Plasma Version: 5.14.4
Qt Version: 5.11.1
KDE Frameworks Version: 5.52.0
Add main categories in the .desktop file to show it appropriately in some desktop environments. The previous
Specifying 
GNOME users don't bother this because GNOME doesn't have menu categories by default. Other desktop environments are not tested.
Reference: freedesktop.org Desktop Menu Specification
Categories=Chat;entry put electronic-wechat into Lost & Found category because it didn't specify the main category. "Chat" is an additional category.Categories=Network;Utility;Chat;put electronic-wechat into "Internet" and "Utilities" categories in KDE Plasma.My desktop environment: Operating System: Kubuntu 18.10 KDE Plasma Version: 5.14.4 Qt Version: 5.11.1 KDE Frameworks Version: 5.52.0