Current behavior:

-Additional storage is required for each language you use. Not using a specific language doesn't uninstall the language or reduce the storage requirement. 

-Storage capacity is purchased by customer for storing data and records in CRM however due to this language packs installation, the storage is occupied by language packs which is provided by Microsoft for providing CRM users to use CRM environment in different languages.

-Therefore, the more language pack customer will install, the more storage capacity it would consumed leading to which customer has to purchase more storage capacity which is not convenient.

-There is an option to disable/remove language packs which are not required however it is not feasible solution for customers who have users across globe and therefore need different language packs to be installed.

Expect behavior:

Installation of language packs should not contribute to storage capacity which will help the customer to utilize the purchased storage capacity to store their records and data in CRM environment (not for something like language packs which is provided by Microsoft to improve utilization of CRM)