Add esc and tab to the Persian layout

check_layout.output

@@ -7,8 +7,7 @@ Layout includes some ASCII punctuation but not all, missing: ", %, ', +, ,, ., :
 1 warnings
 # res/xml/arab_pc_ir.xml
 Layout includes some ASCII punctuation but not all, missing: ", %, ', ,, /, ;, <, =, >, ?, [, \, ], `, {, |, }
-Layout doesn't define some important keys, missing: esc, tab
-2 warnings
+1 warnings
 # res/xml/arab_pc.xml
 Layout includes some ASCII punctuation but not all, missing: !, ', +, ;, ?, \, |
 1 warnings

res/xml/arab_pc_ir.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <keyboard name="Persian PC" script="persian">
   <row>
-    <key key0="ض" key2="۱"/>
+    <key key0="ض" key2="۱" key4="esc"/>
     <key key0="ص" key2="۲" key1="~" key3="\@"/>
     <key key0="ث" key2="۳" key1="!" key3="\#"/>
     <key key0="ق" key2="۴" key1="﷼" key3="$"/>
@@ -14,7 +14,7 @@
     <key key0="ج" key1="f11_placeholder" key3="f12_placeholder"/>
   </row>
   <row>
-    <key key0="ش"/>
+    <key key0="ش" key2="tab"/>
     <key key0="س"/>
     <key key0="ی" key2="ئ"/>
     <key key0="ب"/>