Clean-up unused string ids propagation for screenshots generation

[nroggeman-ledger]

Description

The goal of this PR is to clean-up unused string id propagation when generating screenshots.
The string ids are now directly retrieved from the strings.

Changes include

• Bugfix (non-breaking change that solves an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (change that is not backwards-compatible and/or changes current functionality)
• Tests
• Documentation
• [*] Other (for changes that might not fit in any category)

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.92%. Comparing base (66ebb82) to head (430fd39).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #653   +/-   ##
=======================================
  Coverage   59.92%   59.92%           
=======================================
  Files          12       12           
  Lines        1682     1682           
=======================================
  Hits         1008     1008           
  Misses        674      674           

Flag	Coverage Δ
unittests	59.92% <ø> (ø)

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