Placeholders for messages.yml

Where the placeholders should be useful. Placeholders replacement is under progressing.

Placeholder	Description
{PLAYER}	The player name
{CURRENT_RANK}	The current player's rank name
{CURRENT_RANK_PREFIX}	The current player's rank prefix
{NEW_RANK}	The new player's rank name
{NEW_RANK_PREFIX}	The new player's rank prefix
{RANK_PAGES}	The current amount of page
{RANK_PAGES_MAXIMUM}	The max amount of pages
{CURRENT_PRESTIGE}	The player's rank name
{NEW_PRESTIGE}	The new player's rank name
{PLAYTIME}	The date player's time
{DATE}	The last update changed rank
{POSITION_RANK}	The position rank name of players in /topranks