chore(i18n): Fixed grammar

[rakekniven]

No description provided.

[github-actions]

SpotBugs

Category	Base	New
Bad practice	35	35
Correctness	34	34
Dodgy code	26	26
Internationalization	6	6
Malicious code vulnerability	49	49
Multithreaded correctness	3	3
Performance	8	8
Total	161	161

[nextcloud-android-bot]

master-IT test failed: https://www.kaminsky.me/nc-dev/android-library-integrationTests/3789-IT-master-09-51/debug/

[github-actions]

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