[WifiTrackerLib] Add string for low quality connections

Added string "Low quality" for low quality connections (i.e. validated
but wifi is not the default route).

Bug: 163627176
Test: build
Change-Id: I5bb252d1590c73676427dc76e52b7456a2260c74
diff --git a/libs/WifiTrackerLib/res/values/strings.xml b/libs/WifiTrackerLib/res/values/strings.xml
index 7e81b58..c47e289 100644
--- a/libs/WifiTrackerLib/res/values/strings.xml
+++ b/libs/WifiTrackerLib/res/values/strings.xml
@@ -85,6 +85,9 @@
     <!-- Summary for Connected wifi network without internet [CHAR LIMIT=NONE] -->
     <string name="wifi_connected_no_internet">No internet</string>
 
+    <!-- Summary for Connected wifi network with a low quality connection [CHAR LIMIT=NONE] -->
+    <string name="wifi_connected_low_quality">Low quality</string>
+
     <!-- Do not translate.  Concise terminology for wifi with 802.1x EAP security -->
     <string name="wifi_security_short_eap" translatable="false">802.1x</string>