[postgis-tickets] [PostGIS] #5454: po files keep growing on `update-po`

[PostGIS]

#5454: po files keep growing on `update-po`
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 Reporter:  strk    |      Owner:  robe
     Type:  defect  |     Status:  new
 Priority:  medium  |  Milestone:  PostGIS 3.4.0
Component:  l18n    |    Version:
 Keywords:          |
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 The `make update-po` rule leaves old (outdated) translations in the .po
 files, in lines starting with `#~` prefix. This makes these files ever
 growing, so we need to decide on a trimming policy.

 To make an example, the doc/po/ja/reference_processing.xml.po file has
 3553 such lines, and only 3016 lines of used translations.

 It would be useful to know if these translations are ever used by weblate,
 as if they are not we could just strip them in the `make update-po` rule
 itself.
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Ticket URL: <https://trac.osgeo.org/postgis/ticket/5454>
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