Fix testcase to use local calendar object

ludovicp

28.55.2010 adeb7a033d17d48e67c4f680a1b8acc92cb89bfd

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relation.plugin.user-friendly-name=Wtyczka
user-friendly-name=\u015acie\u017cka Wtyczek
relation.plugin.user-friendly-plural-name=Wtyczki