English string changes in r1871

[cor...@corsix.org]

This is an automated message to notify translators that changes have been made
to the English translation file, which usually indicates that equivalent
changes should be made to the other translation files. The changes in r1871 are:
Strings which have been added:
menu_charts.bank_manager
menu_charts.casebook
menu_charts.graphs
menu_charts.policy
menu_charts.research
menu_charts.staff_listing
menu_charts.statement
menu_charts.status
menu_charts.town_map