Miscellaneous history fixes and additions

Opening this pull-request to keep track:

Fixed dead Ostrogothic ruler holding a series of counties in southern Gaul
Fixed the county of Porto not having any history after the death 35
Fixed the bug with the Bureaucratic government retinue bonus not added in the retinue total
Changed the Lombard duchy colours in Rule of Dukes bookmarks to make them more distinct
Added two new dynamic story events around the Isaurian Wars
Fixed bug that caused the Exilarchate to disband as Exilarchs have to have "House of David" trait
Moved Isaurian characters to isaurian.txt
Added a few Isaurian generals
Added some character info links
Added historical war of usurper Leontius
Placeholder localisation for syn.10.a
Fixed the Western Roman Imperial regalia
Changed the names of some historical Popes
Added a dynasty for Samaritan High Priests without a dynasty
Additional Objectives localisation fix
Fixed the culture of St. Andrew

loup99 / WtWSMS