fix of Scope_of_usage label

options.html

@@ -257,7 +257,7 @@
                   <p><input type="text" id="filterLangList" class="container" /></p>
                   <p class="label">Accuracy</p>
                   <p><input type="range" id="filterLangAccuracy" class="container" min="0" max="1" step="0.005"><span id="filterLangAccuracyVal" class="container"></span></p>
-                  <p><span class="label">Scope of using</span></p>
+                  <p><span class="label">Scope of usage</span></p>
                   <div class="container">
                     <p><span class="label">in postboard</span> <input type="checkbox" id="filterLangForPostboard" /></p>
                     <p><span class="label">in search result</span> <input type="checkbox" id="filterLangForSearching" /></p>