Add strings for #262 and #263

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

@@ -109,4 +109,7 @@
     <string name="window_querylog_information">Information</string>
 
     <string name="about_help_faq">Frequently asked questions</string>
+
+    <string name="warning_server_currently_unstable">The server %1s seems to be unstable right now.</string>
+    <string name="warning_server_currently_unstable_expanded">The server %1s seems to be unstable right now, impacting your browsing speed. Consider switching to a more stable server.</string>
 </resources>