16 files declare their use of PoItem
- locale.module in core/modules/ locale/ locale.module 
- Enables the translation of the user interface to languages other than English.
- LocaleJavascriptTranslationTest.php in core/modules/ locale/ tests/ src/ Functional/ LocaleJavascriptTranslationTest.php 
- LocaleLocaleLookupTest.php in core/modules/ locale/ tests/ src/ Functional/ LocaleLocaleLookupTest.php 
- LocaleLookup.php in core/modules/ locale/ src/ LocaleLookup.php 
- LocaleLookupTest.php in core/modules/ locale/ tests/ src/ Unit/ LocaleLookupTest.php 
- LocalePluralFormatTest.php in core/modules/ locale/ tests/ src/ Functional/ LocalePluralFormatTest.php 
- NumericField.php in core/modules/ views/ src/ Plugin/ views/ field/ NumericField.php 
- NumericFormatPluralTest.php in core/modules/ views/ tests/ src/ Functional/ Plugin/ NumericFormatPluralTest.php 
- PluralTranslatableMarkup.php in core/lib/ Drupal/ Core/ StringTranslation/ PluralTranslatableMarkup.php 
- PluralVariants.php in core/modules/ config_translation/ src/ FormElement/ PluralVariants.php 
- PoDatabaseReader.php in core/modules/ locale/ src/ PoDatabaseReader.php 
- PoDatabaseWriter.php in core/modules/ locale/ src/ PoDatabaseWriter.php 
- PoStreamWriterTest.php in core/tests/ Drupal/ Tests/ Component/ Gettext/ PoStreamWriterTest.php 
- StringBase.php in core/modules/ locale/ src/ StringBase.php 
- system.module in core/modules/ system/ system.module 
- Configuration system that lets administrators modify the workings of the site.
- TranslateEditForm.php in core/modules/ locale/ src/ Form/ TranslateEditForm.php 
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