[SAC] [OSGeo] #2875: Update weblate from 4.14 to 4.15

[OSGeo]

#2875: Update weblate from 4.14 to 4.15
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 Reporter:  robe           |      Owner:  sac@…
     Type:  task           |     Status:  new
 Priority:  normal         |  Milestone:  Sysadmin Contract 2023-I
Component:  Systems Admin  |   Keywords:
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 Currently at 4.14.1

 Key features in 4.15
 https://github.com/WeblateOrg/weblate/releases/tag/weblate-4.15

 * Added support for adding custom markup to HTML head.
 * Added support for choosing different e-mail for commits than for
 notifications.
 * Added team administrators who can add or remove members of the team.
 * Fixed plurals handling in automatic translation from other
 components.
 * Added support for browsing changes for a individual string.
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Ticket URL: <https://trac.osgeo.org/osgeo/ticket/2875>
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