Fixed missing vanilla building descriptions

Adds a new Tier V stables building that allows to recruit both Griffon units from.

Some balance changes and fixing some outdated table.

- Both griffon knights now have 80 armor.

- Some hidden stats have been made based on other similar units.

- Wolf Knights now use imperial generals swords rather than knights of the black rose swords.

Stats and balance changes:

Imperial Pegasus Knights are now Tier 3 and only recruit-able from tier 3 stables and up.

Updated health and morale stats of Wolf Knights to be the same as the new updated demigryph knights