fix character broken (MOJIBAKE) of CHANGELOG

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not use non ASCII characters at CHANGELOG

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German Translation updated by Daniel Felix (#16542)

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fix typos of source comments at lib/redmine/hook.rb

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fix typos of source comments at lib/redmine/plugin.rb

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fix typos of source comments at lib/redmine/wiki_formatting.rb

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fix typos of source comments at ApplicationHelper

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fix typos of source comments at Enumeration model

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fix typos of source comments at Issue model

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fix typos of source comments at Member model

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fix typos of source comments at Project model

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fix typos of source comments at Query model

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