Removed locale (text has changed, anyway)
Added logic to add "thanks count" field to several tables

* Field added to User, Discussion and Comment tables.
Added model classes

* Model classes extand basic Vanilla Forums models by adding functions aimed to update the amount of thanks received by each object (User, Discussion, Comment, etc).
Updated code documentation
Added UserModel::RecalculateReceivedThanksCount() method
Added UserID parameter for UserModel::RecalculateReceivedThanksCount() method
Altered v_TP_ObjectReceivedThanks

* View now shows a single total per user, without breaking it down by object type.
Fixed query in UserModel::RecalculateReceivedThanksCount() method
Altered MessageThanksModule widget

* Removed "revoke thanks" function (it will be implemented later).
* Added label indicating the amount of thanks received by an object.
Refactored ThanksLog model

* Extracted methods related to Users, Discussions and Comments to separate models.
* Implemented cleanup logic, to remove orphaned thanks.
* Implemented logic to recalculate thanks for a user.
Cleaned up code and improved documentation