Added link to Weblate from translatable strings once the translator mode

is activated in the workspace settings. This required the addition of a
new lib (in source form) for a SipHash implementation.

siphash-zackehh/src/test/java/com/zackehh/siphash/SipHashKeyTest.java

@@ -0,0 +1,27 @@
+package com.zackehh.siphash;
+
+import org.testng.Assert;
+import org.testng.annotations.Test;
+
+public class SipHashKeyTest {
+
+    @Test
+    public void initializeWithKey() throws Exception {
+        SipHashKey key = new SipHashKey("0123456789ABCDEF".getBytes());
+
+        long k0 = SipHashTestUtils.getPrivateField(key, "k0", Long.class);
+        long k1 = SipHashTestUtils.getPrivateField(key, "k1", Long.class);
+
+        Assert.assertEquals(k0, 3978425819141910832L);
+        Assert.assertEquals(k1, 5063528411713059128L);
+    }
+
+    @Test(
+        expectedExceptions = IllegalArgumentException.class,
+        expectedExceptionsMessageRegExp = "Key must be exactly 16 bytes!"
+    )
+    public void initializeWithKeyTooLong() throws Exception {
+        new SipHashKey("0123456789ABCDEFG".getBytes()); // 17 bytes
+    }
+
+}