chore(l10n): revise description of copy code option on terracotta page

Revise to make it clearer for new users.

The relevant text remains in Simplified Chinese characters in
Traditional Chinese, as PCL CE is currently only available
in Simplified Chinese.

Remove the description of PCL CE in English due to the excessive
length of the text and the language situation of PCL CE mentioned
in the previous paragraph.

Author: 3gf8jv4dv

HMCL/src/main/resources/assets/lang/I18N.properties

@@ -1456,7 +1456,7 @@ terracotta.status.host_starting.back=This will stop creating the room.
 terracotta.status.host_ok=Room created
 terracotta.status.host_ok.code=Invitation code (Copied)
 terracotta.status.host_ok.code.copy=Copy invitation code
-terracotta.status.host_ok.code.desc=Please remind your friends to select Guest mode in HMCL - Multiplayer or PCL CE and enter this invitation code.
+terracotta.status.host_ok.code.desc=Please remind your friends to select "I want to join a session"\non the HMCL Multiplayer page and enter this invitation code.
 terracotta.status.host_ok.back=This will also close the room, other guests will leave and cannot rejoin.
 terracotta.status.guest_starting=Joining room
 terracotta.status.guest_starting.back=This will not stop other guests from joining the room.

HMCL/src/main/resources/assets/lang/I18N_zh.properties

@@ -1244,7 +1244,7 @@ terracotta.status.host_starting.back=這將會取消建立房間。
 terracotta.status.host_ok=已建立房間
 terracotta.status.host_ok.code=邀請碼（已自動複製到剪貼簿）
 terracotta.status.host_ok.code.copy=複製邀請碼
-terracotta.status.host_ok.code.desc=請提醒您的朋友在 HMCL 或 PCL CE 多人遊戲功能中選擇房客模式，並輸入該邀請碼。
+terracotta.status.host_ok.code.desc=請提醒您的朋友在 HMCL 多人遊戲或 PCL CE 联机大厅中\n選取「我想當房客」或「加入大厅」，並輸入該邀請碼。
 terracotta.status.host_ok.back=這將同時徹底關閉房間，其他房客將退出並不再能重新加入該房間。
 terracotta.status.guest_starting=正在加入房間
 terracotta.status.guest_starting.back=這不會影響其他房客加入目前房間。

HMCL/src/main/resources/assets/lang/I18N_zh_CN.properties

@@ -1254,7 +1254,7 @@ terracotta.status.host_starting.back=这将会取消创建房间。
 terracotta.status.host_ok=已启动房间
 terracotta.status.host_ok.code=邀请码（已自动复制到剪贴板）
 terracotta.status.host_ok.code.copy=复制邀请码
-terracotta.status.host_ok.code.desc=请提醒您的朋友在 HMCL 或 PCL CE 多人联机功能中选择房客模式，并输入该邀请码。
+terracotta.status.host_ok.code.desc=请提醒您的朋友在 HMCL 多人联机或 PCL CE 联机大厅中\n选择“我想当房客”或“加入大厅”，并输入该邀请码。
 terracotta.status.host_ok.back=这将同时彻底关闭房间，其他房客将退出并不再能重新加入该房间。
 terracotta.status.guest_starting=正在加入房间
 terracotta.status.guest_starting.back=这不会影响其他房客加入当前房间。