Pontoon: Update Arabic (ar) localization of Firefox
Co-authored-by: Francesco Lodolo [:flod] <flod+pontoon@mozilla.com>
<!-- This Source Code Form is subject to the terms of the Mozilla Public
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<!ENTITY editfield0.label "اسم المستخدم:">
<!ENTITY editfield1.label "كلمة السرّ:">
<!ENTITY copyCmd.label "انسخ">
<!ENTITY copyCmd.accesskey "ن">
<!ENTITY selectAllCmd.label "اختر الكل">
<!ENTITY selectAllCmd.accesskey "ك">