compare between android string files

is there a tool or a way to compare between 2 string.xml files in android so i can find out the missing words in my localization ?

like for example when i have in my english strings.xml file the following tags:

<string name="A">A</string>
<string name="B">B</string>
<string name="C">C</string>

and in my arabic strings.xml file the following tags:

<string name="A">A</string>
<string name="C">C</string>

how can i know that

    <string name="B">B</string>

is missing