Small fixes: export frequency text, migrations, title sort, dead code

Export frequency of 3 days shows "Every ": settings_auto_export_frequency_value has no 3 case, although 3 days is one of the slider values (automaticExportFrequenciesValues). This affects every language.
Migrations not atomic: the database migrations to v2 and v3 remove the notes, then put them back, in separate transactions (the clear() of v2 even runs outside any transaction). The v3 migration changes the id of each note, so its label links, stored by id, are lost. This only affects users updating from very old versions.
Sort by title is case-sensitive: "b" comes after "Z", unlike the sort of the labels.
Dead code: PreferenceKey.preferenceSecure always throws an ArgumentError (it calls get on a securely stored key) and is never used.

refactor(database): remove the unused putAllLabels

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