This update shortens the names used for internal many-to-many relationship indexes to avoid database naming limits. It also adds a warning when a name still needs to be shortened, helping maintainers spot potential issues earlier without affecting everyday users.

update the naming of the m2m indices

use the shorter name suggested by @antonylessuisse. closes #2780

This update adds checks to ensure database table and column names follow safe length limits before they are used. It helps prevent setup or customization errors that could cause failures later, especially around relationship fields.

This update corrects grammar and spelling in the CRM documentation README. It improves readability and professionalism without changing product behavior or business workflows.

grammar/spelling