Divide list of sources with mappings to a variable over two columns

[BrendaHijmans]

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What version of EMX2 are you using (see footer) v11.25.0

Describe the bug In data catalogue production, the list of sources that mapped to a variable was split into two columns when it was long, see picture:

This looked better than what it looks like now, in one long list:

To Reproduce Steps to reproduce the behavior:

1. Go to https://data-catalogue-acc.molgeniscloud.org/catalogue/ssr-catalogue/EHEN/variables/agebirth_m_y-LifeCycle-core-LifeCycle?keys={%22name%22:%22agebirth_m_y%22,%22resource%22:{%22id%22:%22LifeCycle%22},%22dataset%22:{%22name%22:%22core%22,%22resource%22:{%22id%22:%22LifeCycle%22}}}
2. See that list of sources is long and presentation looks less good than before.

Expected behavior If the list of sources is longer than 10, start a new column of sources.

Screenshots If applicable, add screenshots to help explain your problem.

Desktop (please complete the following information):

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Smartphone (please complete the following information):

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