New dig site: Echoes of the Unseen.

Updated some triggers and added compatibility triggers on request.

Fixed a typo in localization.

Updated for Stellaris 3.13.
New dig site: Old Forge.
The Shaded Empire chain now generate new systems for clues.

Added missing localization.

Loosened the restrictions for spawning the leads for the Shaded Empire.

Removed localization files present in external translations.

Added a missing localization.

Removed the astral rift part of Celestial Disturbance since it had numerous issues.
I will eventually come back to it on a later update.

Code tweaks.