Normalize the applicationName used in user agent, as HTTP spec does not allow UTF-8 chars in headers.

libraries/core/src/main/kotlin/io/element/android/libraries/core/extensions/BasicExtensions.kt

@@ -8,6 +8,7 @@
 
 package io.element.android.libraries.core.extensions
 
+import java.text.Normalizer
 import java.util.Locale
 
 fun Boolean.toOnOff() = if (this) "ON" else "OFF"
@@ -114,3 +115,14 @@ fun String.toSafeLength(
         this
     }
 }
+
+/**
+ * Remove accents and replace special characters by ASCII from the string.
+ * For instance, "é" will be replaced by "e", "ç" by "c", etc.
+ */
+fun String.normalized(): String {
+    // Normalize the string.
+    return Normalizer.normalize(this, Normalizer.Form.NFD)
+        // then keep only ASCII characters and replace non-ASCII characters with an empty string.
+        .replace("[^\\p{ASCII}]".toRegex(), "")
+}

libraries/core/src/test/kotlin/io/element/android/libraries/core/extensions/BasicExtensionsTest.kt

@@ -74,4 +74,10 @@ class BasicExtensionsTest {
         val result = textWithDirectionOverrides.filterDirectionOverrides()
         assertEquals("123456789", result)
     }
+
+    @Test
+    fun `normalized removes accents and replace special characters from text`() {
+        assertEquals("Stefan", "Ștefan".normalized())
+        assertEquals("ca enleve etre", "ça enlève être".normalized())
+    }
 }