Uses client's language as the plugin's language

[TheBlueKingLP]

Description of feature/improvement request:
The message sent to players are depend on the language set on their client

Detailed explanation of what it should do, when and in what situation:

For example, player A, who has their language of their client set to English, will receive text from CMI in English. Player B, who has their language of their client set to Japanese, will receive text from CMI in Japanese.
When the language of a player is not available in the config folder of the plugin, a default language will be shown instead.

Basic explanation as to why this feature is needed and/or useful to have:

Some player prefer to use their home country's language, while this plugin allows server owners to translate the plugin, individual players can't set their own language.