Remove unused string resources

[mbiebl]

The list was computed in an automated way and includes:

intro_battery_not_whitelisted
intro_battery_whitelisted
permissions_jtx_status_off
permissions_jtx_status_on
about_flavor_info
about_translations_thanks
install_email_client
accounts_global_sync_disabled
accounts_global_sync_enable
app_settings_tasks_provider_synchronizing_with
account_no_address_books
account_no_calendars
account_no_webcals
account_swipe_down
account_create_new_address_book
account_create_new_calendar
settings_title
settings_enter_username
settings_enter_password
settings_key_default_alarm
certificate_notification_connection_security
trust_certificate_unknown_certificate_found

[mbiebl]

Please review the list carefully. It was created via grep/sed and might contain false positives.

[CLAassistant]

All committers have signed the CLA.

[ArnyminerZ]

@mbiebl please, sign the CLA

[mbiebl]

not sure about about_flavor_info btw and if it's needed for the custom builds. A lot of the strings though appear unused as a result of the ongoing Compose migration work.

[rfc2822]

not sure about about_flavor_info btw and if it's needed for the custom builds.

Everything that isn't used in the ose flavor doesn't belong to this repo.

A lot of the strings though appear unused as a result of the ongoing Compose migration work.

Yes, there were a lot of changes and adaptions. While rewriting to Compose, many details have also be improved and thus strings have changed.