The class="cohort-select" selector on https://outreachdashboard.wmflabs.org/explore should be of length adequate to accommodate texts in it. Take a look here: https://outreachdashboard.wmflabs.org/explore?locale=uk (yes in this particular case the translation can be changed to a shorter one, but it's better to provide flexibility)
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It looks like this is okay now? Please reopen and provide a screenshot of the problem if not.