[PATCH] Merge duplicate theatron templates

[elexis]

The templates for the theatron are duplicated and should just use a parent template.

Code duplication results in one of the copies not being updated when changing things (and has already happened to that and many other files, for example ConquestCritical wasn't updated in theb_theatron).

This might be the case with other templates too and should be checked.

Refs #4021, #4022

[fatherbushido]

or this one with the same sound for the theb one too

[fatherbushido]

nuke the theb_theatron template as it is used nowhere

[elexis]

In 18269:

Template cleanup. Patch by fatherbushido, fixes #4016.

Removes duplicate theatron templates and use a parent template instead.
Removes unused Theban theatron.
Fixes a buildtime inconsistency.
Also improve the tooltip string as suggested by leper.

[elexis]

Thanks, keep it up!

[elexis]

In 18270:

Actually delete it, refs #4016.