Unable to upgrade to Zammad 5.1

[martini]

Infos:

• Used Zammad version: 5.1 (develop)
• Installation method (source, package, ..): any
• Operating system: any
• Database + version: any
• Elasticsearch version: any
• Browser + version: any

Expected behavior:

• Execute zammad run rails r Translation.sync without error

Actual behavior:

zammad run rails r Translation.sync
[1mTraceback�[m (most recent call last): 
29: from bin/rails:9:in `<main>' 
28: from /opt/zammad/ruby-2.7.4/gems/bootsnap-1.10.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require' 
27: from /opt/zammad/ruby-2.7.4/gems/bootsnap-1.10.3/lib/bootsnap/load_path_cache/core_ext/kernel_require.rb:30:in `require' 
26: from /opt/zammad/ruby-2.7.4/gems/railties-6.0.4.6/lib/rails/commands.rb:18:in `<main>' 
25: from /opt/zammad/ruby-2.7.4/gems/railties-6.0.4.6/lib/rails/command.rb:46:in `invoke' 
24: from /opt/zammad/ruby-2.7.4/gems/railties-6.0.4.6/lib/rails/command/base.rb:69:in `perform' 
23: from /opt/zammad/ruby-2.7.4/gems/thor-1.2.1/lib/thor.rb:392:in `dispatch' 
22: from /opt/zammad/ruby-2.7.4/gems/thor-1.2.1/lib/thor/invocation.rb:127:in `invoke_command' 
21: from /opt/zammad/ruby-2.7.4/gems/thor-1.2.1/lib/thor/command.rb:27:in `run' 
20: from /opt/zammad/ruby-2.7.4/gems/railties-6.0.4.6/lib/rails/commands/runner/runner_command.rb:45:in `perform' 
19: from /opt/zammad/ruby-2.7.4/gems/railties-6.0.4.6/lib/rails/commands/runner/runner_command.rb:45:in `eval' 
18: from /opt/zammad/ruby-2.7.4/gems/railties-6.0.4.6/lib/rails/commands/runner/runner_command.rb:45:in `<main>' 
17: from /opt/zammad/app/models/translation/synchronizes_from_po.rb:11:in `sync' 
16: from /opt/zammad/ruby-2.7.4/gems/activerecord-6.0.4.6/lib/active_record/relation/delegation.rb:88:in `each' 
15: from /opt/zammad/ruby-2.7.4/gems/activerecord-6.0.4.6/lib/active_record/relation/delegation.rb:88:in `each' 
14: from /opt/zammad/app/models/translation/synchronizes_from_po.rb:12:in `block in sync' 
13: from /opt/zammad/ruby-2.7.4/gems/activerecord-6.0.4.6/lib/active_record/transactions.rb:212:in `transaction' 
12: from /opt/zammad/ruby-2.7.4/gems/activerecord-6.0.4.6/lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `transaction' 
11: from /opt/zammad/ruby-2.7.4/gems/activerecord-6.0.4.6/lib/active_record/connection_adapters/abstract/transaction.rb:278:in `within_new_transaction' 
10: from /opt/zammad/ruby-2.7.4/gems/activesupport-6.0.4.6/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `synchronize'
 9: from /opt/zammad/ruby-2.7.4/gems/activesupport-6.0.4.6/lib/active_support/concurrency/load_interlock_aware_monitor.rb:21:in `handle_interrupt'
 8: from /opt/zammad/ruby-2.7.4/gems/activesupport-6.0.4.6/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `block in synchronize'
 7: from /opt/zammad/ruby-2.7.4/gems/activesupport-6.0.4.6/lib/active_support/concurrency/load_interlock_aware_monitor.rb:25:in `handle_interrupt'
 6: from /opt/zammad/ruby-2.7.4/gems/activesupport-6.0.4.6/lib/active_support/concurrency/load_interlock_aware_monitor.rb:26:in `block (2 levels) in synchronize'
 5: from /opt/zammad/ruby-2.7.4/gems/activerecord-6.0.4.6/lib/active_record/connection_adapters/abstract/transaction.rb:280:in `block in within_new_transaction'
 4: from /opt/zammad/ruby-2.7.4/gems/activerecord-6.0.4.6/lib/active_record/connection_adapters/abstract/database_statements.rb:280:in `block in transaction'
 3: from /opt/zammad/app/models/translation/synchronizes_from_po.rb:13:in `block (2 levels) in sync'
 2: from /opt/zammad/app/models/translation/synchronizes_from_po.rb:24:in `sync_locale_from_po'
 1: from /opt/zammad/app/models/translation/synchronizes_from_po.rb:70:in `strings_for_locale' /opt/zammad/app/models/translation/synchronizes_from_po.rb:98:in `po_files_for_locale': �[1mNo translation found for locale 'zj-tw'. (�[1;4mRuntimeError�[m�[1m)�

Workaround:

zammad run rails r "Locale.where(locale: 'zj-tw').destroy_all"
zammad run rails r "Translation.where(locale: 'zj-tw').destroy_all"