Move from Bootstrap v3 to v5

Antonio Terceirorequested to merge
bootstrap-5 into master

Most of the changes are due to the upgrade itself, but during the process I ended up making small layout adjustments and fixing broken markup here and there.

Closes: #1088408

Before:

Captura_de_tela_de_2026-03-22_09-30-07

After:

image

Edited by Antonio Terceiro

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