The cache held the category names in all 96 app store languages
(about 49 KB), while an instance typically uses one or two. Keep only
English, the default language and the languages users have set, as the
two-letter codes the lookup uses; on a Dutch instance this is about
1.3 KB.
A user who switches to a language that is not cached yet sees English
names until the cache is refreshed after a week, or right away when an
admin saves the settings. The README mentions this.
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