a11y lock-screen

Signed-off-by: Andy Scherzinger <info@andy-scherzinger.de>

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

@@ -46,6 +46,7 @@
             android:layout_width="32dp"
             android:layout_height="32dp"
             android:layout_gravity="center"
+            android:contentDescription="@string/nc_locked"
             android:src="@drawable/ic_lock_white_24px" />
 
     </FrameLayout>
@@ -57,7 +58,7 @@
         android:layout_gravity="center_horizontal"
         android:paddingTop="16dp"
         android:paddingBottom="56dp"
-        android:text="@string/nc_locked"
+        android:text="@string/nc_locked_tap_to_unlock"
         android:textAlignment="center"
         android:textColor="@color/textColorOnPrimaryBackground"
         android:textSize="22sp" />

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

@@ -128,7 +128,8 @@
     <string name="nc_settings_link_previews_desc">Allows previews of content from received links for supported services</string>
     <string name="nc_settings_link_previews_key" translatable="false">link_previews</string>
     <string name="nc_settings_read_privacy_key" translatable="false">read_privacy</string>
-    <string name="nc_locked">Tap to unlock</string>
+    <string name="nc_locked_tap_to_unlock">Tap to unlock</string>
+    <string name="nc_locked">locked</string>
     <string name="nc_settings_read_privacy_desc">Share my read-status and show the read-status of others</string>
     <string name="nc_settings_read_privacy_title">Read status</string>