More verbosity when reporting broken dictionaries

Also added toString for AssetFileAddress for easier debugging.

Change-Id: Ie5d15d12bae46c31b28d8c67002e627f4c6690e3

java/src/com/android/inputmethod/latin/AssetFileAddress.java

@@ -62,4 +62,9 @@ public final class AssetFileAddress {
     public void deleteUnderlyingFile() {
         FileUtils.deleteRecursively(new File(mFilename));
     }
+
+    @Override
+    public String toString() {
+        return String.format("%s (offset=%d, length=%d)", mFilename, mOffset, mLength);
+    }
 }

java/src/com/android/inputmethod/latin/BinaryDictionaryGetter.java

@@ -284,7 +284,8 @@ final public class BinaryDictionaryGetter {
                 final AssetFileAddress afa = AssetFileAddress.makeFromFileName(f.getPath());
                 if (null != afa) fileList.add(afa);
             } else {
-                Log.e(TAG, "Found a cached dictionary file but cannot read or use it");
+                Log.e(TAG, "Found a cached dictionary file for " + locale.toString()
+                        + " but cannot read or use it");
             }
         }