dev/translation#4 - Upgrade script for nl_BE

[demeritcowboy]

Overview

Adds missing upgrade step to add the option value for existing installs.

Before

E_NOTICE and can't select the language.

After

Good

Comments

Doesn't need backport if going with #17021

[civibot]

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[seamuslee001]

Looks good to me merging

[demeritcowboy]

Thanks. Just realized I missed an edge-case since the update for nl_NL doesn't limit to the option_group_id. Will put up a PR.

[totten]

FWIW, I did an r-run of this locally. It worked as advertised in the current version, but I was concerned about future-proofing the upgrade steps - hence #17048.