make all strings translatable

app/src/main/AndroidManifest.xml

@@ -74,12 +74,10 @@
             android:parentActivityName=".VideoItemDetailActivity"
             tools:ignore="UnusedAttribute">
         </activity>
-        <!--TODO: make label a translatable string -->
         <service
             android:name=".BackgroundPlayer"
-            android:label="NewPipe Background Player"
-            android:exported="false" >
-        </service>
+            android:label="@string/background_player_name"
+            android:exported="false" />
         <activity
             android:name=".SettingsActivity"
             android:label="@string/title_activity_settings" >

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

@@ -8,7 +8,7 @@
     <TextView
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
-        android:text="Loading"
+        android:text="@string/loading"
         android:textAppearance="?android:attr/textAppearanceMedium" />
 
     <ProgressBar

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

@@ -1,6 +1,7 @@
 <?xml version='1.0' encoding='utf-8'?>
 <resources>
     <string name="app_name" translatable="false">NewPipe</string>
+    <string name="background_player_name">NewPipe Background Player</string>
     <string name="title_videoitem_detail" translatable="false">NewPipe</string>
     <string name="viewCountText">%1$s views</string>
     <string name="uploadDateText">Uploaded on %1$s</string>
@@ -10,6 +11,7 @@
     <string name="fdroidVLCurl" translatable="false">https://f-droid.org/repository/browse/?fdfilter=vlc&amp;fdid=org.videolan.vlc</string>
     <string name="open_in_browser">Open in browser</string>
     <string name="share">Share</string>
+    <string name="loading">Loading</string>
     <string name="download">Download</string>
     <string name="search">Search</string>
     <string name="settings">Settings</string>