style(GUI): improve wording of supported extensions label (#807)

- Change "and many more" to "and others"

See: https://github.com/resin-io/etcher/issues/787
Signed-off-by: Juan Cruz Viotti <jviotti@openmailbox.org>

lib/gui/pages/main/templates/main.tpl.html

@@ -12,7 +12,7 @@
           <p class="step-footer">
             {{ ::image.mainSupportedExtensions.join(', ') }}, and
             <span class="step-footer-underline"
-              uib-tooltip="{{ image.extraSupportedExtensions.join(', ') }}">many more</span>
+              uib-tooltip="{{ image.extraSupportedExtensions.join(', ') }}">others</span>
           </p>
         </div>
         <div ng-if="main.selection.hasImage()">