Improve ASCII transliterator

We should use NFKD instead of NFD since we are flattening to US-ASCII
afterwards anyway. This allows various Unicode characters which would
end up as a question mark to be represented by their compatibility
decomposition. This applies to e.g. ligatures (e.g. U+FB01 LATIN SMALL
LIGATURE FI will now be replaced with plain fi instead of a question
mark), and also the U+00A0 NO-BREAK SPACE [NBSP] to be replaced by
a normal space instead of a question mark.

+Add Czech fancy quotes to the Czech transliterator
+Add a unit test for Multitransliterator

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/language/impl/CzechTransliterator.java

@@ -27,6 +27,7 @@ public class CzechTransliterator extends SimpleTransliterator {
         super(new HashMap<Character, String>() {{
             put('ř',"r"); put('ě',"e"); put('ý',"y"); put('á',"a"); put('í',"i"); put('é',"e");
             put('ó',"o"); put('ú',"u"); put('ů',"u"); put('ď',"d"); put('ť',"t"); put('ň',"n");
+            put('„', "\""); put('“', "\""); put('‚', "'"); put('‘', "'");
         }});
     }
 }

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/language/impl/FlattenToAsciiTransliterator.java

@@ -32,8 +32,8 @@ public class FlattenToAsciiTransliterator implements Transliterator {
             return txt;
         }
 
-        // Decompose the string into its canonical decomposition (splits base characters from accents/marks)
+        // Decompose the string into its compatible decomposition (splits base characters from accents/marks, and changes some characters to compatibility version)
-        txt = Normalizer.normalize(txt, Normalizer.Form.NFD);
+        txt = Normalizer.normalize(txt, Normalizer.Form.NFKD);
         // Remove all marks (characters intended to be combined with another character), keeping the base glyphs
         txt = txt.replaceAll("\\p{M}", "");
         // Flatten the resulting string to ASCII

app/src/test/java/nodomain/freeyourgadget/gadgetbridge/util/language/LanguageUtilsTest.java

@@ -4,9 +4,13 @@ import android.content.SharedPreferences;
 
 import org.junit.Test;
 
+import java.util.Arrays;
+
 import nodomain.freeyourgadget.gadgetbridge.GBApplication;
 import nodomain.freeyourgadget.gadgetbridge.impl.GBDevice;
 import nodomain.freeyourgadget.gadgetbridge.test.TestBase;
+import nodomain.freeyourgadget.gadgetbridge.util.language.impl.CzechTransliterator;
+import nodomain.freeyourgadget.gadgetbridge.util.language.impl.ExtendedAsciiTransliterator;
 import nodomain.freeyourgadget.gadgetbridge.util.language.impl.FlattenToAsciiTransliterator;
 
 import static org.junit.Assert.assertEquals;
@@ -227,12 +231,23 @@ public class LanguageUtilsTest extends TestBase {
     @Test
     public void testFlattenToAscii() throws Exception {
         final FlattenToAsciiTransliterator transliterator = new FlattenToAsciiTransliterator();
-        String input = "ä ș ț ă";
+        String input = "ä ș ț ă fine";
         String output = transliterator.transliterate(input);
-        String expected = "a s t a";
+        String expected = "a s t a fine";
         assertEquals("flatten to ascii transliteration failed", expected, output);
     }
 
+    @Test
+    public void testMultitransliterator() throws Exception {
+        final MultiTransliterator multiTransliterator = new MultiTransliterator(Arrays.asList(
+                new CzechTransliterator(),
+                new ExtendedAsciiTransliterator(),
+                new FlattenToAsciiTransliterator()
+        ));
+        assertEquals("Zlutoucky kun upel \"dabelske\" \"ody\"", multiTransliterator.transliterate("Žluťoučký kůň úpěl »ďábelské« „ódy“"));
+        assertEquals("300 Kc", multiTransliterator.transliterate("300\u00A0Kč"));
+    }
+
     @Test
     public void testTransliterateOption() throws Exception {
         enableTransliteration(false);