It is not always clear for administrators installing MantisBT, what is the combined effect of $g_db_table_prefix, $g_db_table_plugin_prefix and $g_db_table_suffix on the database tables' names.

Providing a preview of what "Core" and plugin tables names would look like when updating the options in the installer, would avoid surprises.

Due to a bug in db_get_table() (see 0020168), the use of string mantis as table_plugin_prefix can result in errors when installing, upgrading or even just simply using plugins with custom tables (see 0022811, https://github.com/mantisbt-plugins/source-integration/issues/212).