refactor - rename string resource name `remove_episode_lable` , which was ambiguous with typos, to `delete_episode_label`

- non-default string resources to be handled by Transifex

app/src/main/res/layout/downloaded_episodeslist_item.xml

@@ -92,7 +92,7 @@
         android:layout_height="match_parent"
         android:background="?attr/selectableItemBackground"
         android:clickable="false"
-        android:contentDescription="@string/remove_episode_lable"
+        android:contentDescription="@string/delete_episode_label"
         android:focusable="false"
         android:focusableInTouchMode="false"
         android:src="?attr/content_discard"

app/src/main/res/menu/episodes_apply_action_speeddial.xml

@@ -7,7 +7,7 @@
       -->
     <item android:id="@+id/delete_batch"
         android:icon="?attr/content_discard"
-        android:title="@string/remove_episode_lable"
+        android:title="@string/delete_episode_label"
         />
     <item android:id="@+id/download_batch"
         android:icon="?attr/av_download"

core/src/main/res/values/strings.xml

@@ -177,7 +177,7 @@
     <string name="remove_label">Remove</string>
     <string name="delete_label">Delete</string>
     <string name="delete_failed">Unable to delete file. Rebooting the device could help.</string>
-    <string name="remove_episode_lable">Delete Episode</string>
+    <string name="delete_episode_label">Delete Episode</string>
     <plurals name="deleted_episode_batch_label">
         <item quantity="one">%d episode deleted.</item>
         <item quantity="other">%d episodes deleted.</item>