MultiImageBlockComponent:grid of four with caption

Build 139 on revert-7128-mob/grids-in-articles
1200px
The baseline is taller than the new snapshot (1200x723 to 1200x722).
Baseline History
Build 139e54aee4 current baseline
Current build. Accepted by Georges Lebreton.
Build 305b71e8b
Accepted by Max Duval.
Build 1d4223c6
Auto-accepted
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