Introduce simplePluralStringResource methods, as Composable and in StringProvider.

libraries/ui-utils/src/main/kotlin/io/element/android/libraries/ui/utils/strings/Plurals.kt

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2026 Element Creations Ltd.
+ *
+ * SPDX-License-Identifier: AGPL-3.0-only OR LicenseRef-Element-Commercial.
+ * Please see LICENSE files in the repository root for full details.
+ */
+
+package io.element.android.libraries.ui.utils.strings
+
+import androidx.annotation.StringRes
+import androidx.compose.runtime.Composable
+import androidx.compose.runtime.ReadOnlyComposable
+import androidx.compose.ui.res.stringResource
+
+/**
+ * Similar to [androidx.compose.ui.res.pluralStringResource] but with separate resource ids for singular and plural values.
+ * Useful when we want to use different strings for singular and plural forms but not mentioning the actual quantity in the string.
+ * In this case, we cannot use getQuantityString, because some locales have more than two plural forms, and require the quantity to
+ * be part of the resulting strings.
+ * @param resIdForOne Resource id for the case when [count] is 1.
+ * @param resIdForOthers Resource id for the other cases ([count] is not 1).
+ * @param count The quantity to determine whether to use singular or plural form. Must be greater than or equal to 1.
+ * @param formatArgs The format arguments that will be used for substitution in the resulting string. Will be applied to either
+ * the singular or plural string depending on the quantity.
+ * @return The localized string corresponding to the given quantity.
+ */
+@Composable
+@ReadOnlyComposable
+fun simplePluralStringResource(
+    @StringRes resIdForOne: Int,
+    @StringRes resIdForOthers: Int,
+    count: Int,
+    vararg formatArgs: Any,
+): String {
+    val resId = if (count == 1) resIdForOne else resIdForOthers
+    return stringResource(resId, *formatArgs)
+}