Fastlane metadata directory uses invalid names for some locales

[eighthave]

Fastlane uses BCP47 locale tags, which use a - as the separator rather than _. There are a number of locales that use the _ here. Please rename those dirs to use -.

• https://gitlab.com/fdroid/fdroiddata/-/issues/2323
• New language for App Store Metadata uses unsupported language code WeblateOrg/weblate#5522

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