Fix preview crash on local files during upload (#1696)

* Try to get the localized version of the wikipedia article before defaulting to the English version.

Tested with Spanish on physical Android device.

Other notes:
Difficulties building with gradle due to dexcount plugin: https://github.com/KeepSafe/dexcount-gradle-plugin/issues/234. In testing, disabled the plugin.

* Update article fetch to not include unnecessary SERVICE line

* Add checks for local file, check for string length

app/src/test/kotlin/fr/free/nrw/commons/UtilsTest.kt

@@ -28,4 +28,8 @@ class UtilsTest {
     @Test fun `capitalize - pass Japanase characters`() {
         Assert.assertThat(Utils.capitalize("こんにちは"), _is("こんにちは"))
     }
+
+    @Test fun `capitalize does not fail on empty string`() {
+        Assert.assertThat(Utils.capitalize(""), _is(""))
+    }
 }