Переименование шаблонов email

Переименовываем шаблоны email для возможности их нормальной локализации через Crowdin.

library/language/en/email/admin_send_email.html

@@ -0,0 +1,12 @@
+Charset: UTF-8
+
+The following is an email sent to you by an administrator of "{SITENAME}". If this message is spam, contains abusive or other comments you find offensive please contact the webmaster of the board at the following address:
+
+{BOARD_EMAIL}
+
+Include this full email (particularly the headers).
+
+Message sent to you follows:
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+
+{MESSAGE}