Bug 1692316 - Part 2: Update Print UI Duplex Terminology r=dholbert,fluent-reviewers,sfoster

Updates the print UI to use the new "long edge" and "short edge"
duplex print terminology that is now used in the print platform.

Differential Revision: https://phabricator.services.mozilla.com/D105500

toolkit/components/printing/content/print.html

@@ -188,8 +188,8 @@
               <label class="block-label" for="duplex-select" data-l10n-id="printui-two-sided-printing"></label>
               <select is="setting-select" id="duplex-select" name="duplex-type" class="row" data-setting-name="printDuplex">
                 <option value="off" data-l10n-id="printui-two-sided-printing-off" selected></option>
-                <option value="long-edge" data-l10n-id="printui-two-sided-printing-side-edge"></option>
-                <option value="short-edge" data-l10n-id="printui-two-sided-printing-top-edge"></option>
+                <option value="long-edge" data-l10n-id="printui-two-sided-printing-long-edge"></option>
+                <option value="short-edge" data-l10n-id="printui-two-sided-printing-short-edge"></option>
               </select>
             </section>
 

toolkit/locales/en-US/toolkit/printing/printUI.ftl

@@ -48,10 +48,10 @@ printui-scale-pcent = Scale
 # Section title (noun) for the two-sided print options
 printui-two-sided-printing = Two-sided printing
 printui-two-sided-printing-off = Off
-# Flip the page on the side (like a book).
-printui-two-sided-printing-side-edge = Flip on side edge
-# Flip the page on the top (like a vertical calendar).
-printui-two-sided-printing-top-edge = Flip on top edge
+# Flip the sheet as if it were bound along its long edge.
+printui-two-sided-printing-long-edge = Flip on long edge
+# Flip the sheet as if it were bound along its short edge.
+printui-two-sided-printing-short-edge = Flip on short edge
 
 # Section title for miscellaneous print options
 printui-options = Options