Update strings.xml

[mustafayigitt]

Translated 4 strings to Turkish

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[mustafayigitt]

@googlebot I signed it!

[googlebot]

CLAs look good, thanks!

ℹ️ Googlers: Go here for more info.

[yenerm]

One small fix and looks good to me

[yenerm]

Change 'Mevcut' to 'Mevcut Bitkiler' for consistency.

[tiembo]

Thanks @mustafayigitt! Added you as a translator on the Notable Community Contributions wiki page.