Hello

,
Lets begin with the main chat interface.
http://imgur.com/a/r94KT
There are three chat types :-
1> Clan Chat - Only for players which are in the same clan.
2> Global Chat - For each and every player from different maps in the server with the same language.
3> Local Chat - For every player from a particular map. This is where it differs from global chat. Messages which are typed in this chat can be seen only by those players who are in the same map and have same language.
http://imgur.com/a/EBR7K
Now comes the various languages which you can change by clicking on the little flag in your chat window.
There are 11 different languages and 1 International chat.
http://imgur.com/a/Es4oE
Note that if a player have a different language/flag then you might be able to see his local/global messages above his dino head but you cannot see his messages written in chat window. To see the messages of a player in chat window you need to change your chat language and type to same as his.
Generally, if you are in a clan, then the first chat which you see at the bottom is called
Clan Chat.
http://imgur.com/a/5IbiV
Or if you are not in a clan then the first chat which you see at the bottom is called
Global Chat.
This is where all the players chat from different maps. Every player from different map can use this chat to contact each other. You can also see the location of a player beside his/her message.
http://imgur.com/a/KFGkL
In the
Local Chat.
, all the players from same language and same map can chat.
Local Chat :-
http://imgur.com/a/XaEht
Global Chat :-
http://imgur.com/a/4TKLF
Clan Chat :-
http://imgur.com/a/IV5R3
I hope this helps.
Best Regards,
Pr0Ankit