PiHole widget: added new Percentage block (#1471)

* PiHole widget: added new Percentage block

* update pi-hole percentage

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Co-authored-by: shamoon <4887959+shamoon@users.noreply.github.com>

public/locales/en/common.json

@@ -214,6 +214,7 @@
     "pihole": {
         "queries": "Queries",
         "blocked": "Blocked",
+        "blocked_percent": "Blocked %",
         "gravity": "Gravity"
     },
     "adguard": {