frameit-mmt: Verbalization of scroll-description has problems with recursion

[SESch93]

Initial situation: Added 3 PointFacts P, Q and R via the /fact/add endpoint of the frameit-server

Afterwards, a request to the /scroll/dynamic endpoint of the frameit-server, where we map A |-> P, B -> Q, C |-> R, will lead to a wrong description of the rendered-scroll.

• actual description:

  Given a triangle △PQR right-angled at ⊾R, the opposide side has length CA = tan(∠ABC) ⋅ QR.

• expected description:

  Given a triangle △PQR right-angled at ⊾R, the opposide side has length CA = tan(∠PQR) ⋅ QR.

The culprit is probably the recursive call to verbalize ${lverb angleB} that prints ∠ABC(the default verbalization) without accounting for the assignmentsA |-> P, B |-> Q, C |-> R`.

(edit: @ComFreek extended this bug report with more info)