Change edit shortcut from 'm' to 'e'

I keep missing the shift key when typing shift-m to mark a file
as reviewed and move to next file. With 'm' bound to open file in
editor this is launching me into the edit screen, which is annoying
to get out of.

Swap to 'e' which is currently not bound to anything.

Change-Id: Ia92e1b71cda34bd7d5fd77e8d0423670114e1a0c

gerrit-gwtui/src/main/java/com/google/gerrit/client/diff/SideBySide.java

@@ -371,7 +371,7 @@ public class SideBySide extends Screen {
         .on("O", commentManager.toggleOpenBox(cm))
         .on("Enter", commentManager.toggleOpenBox(cm))
         .on("N", maybeNextVimSearch(cm))
-        .on("M", modifyInEditScreen(cm))
+        .on("E", openEditScreen(cm))
         .on("P", chunkManager.diffChunkNav(cm, Direction.PREV))
         .on("Shift-A", diffTable.toggleA())
         .on("Shift-M", header.reviewedAndNext())
@@ -486,9 +486,9 @@ public class SideBySide extends Screen {
         new NoOpKeyCommand(KeyCommand.M_SHIFT, 'p', PatchUtil.C.commentPrev()));
     keysNavigation.add(
         new NoOpKeyCommand(KeyCommand.M_CTRL, 'f', Gerrit.C.keySearch()));
-    keysNavigation.add(
-        new NoOpKeyCommand(0, 'm', PatchUtil.C.modifyInEditScreen()));
+
     keysAction = new KeyCommandSet(Gerrit.C.sectionActions());
+    keysAction.add(new NoOpKeyCommand(0, 'e', PatchUtil.C.openEditScreen()));
     keysAction.add(new NoOpKeyCommand(0, KeyCodes.KEY_ENTER,
         PatchUtil.C.expandComment()));
     keysAction.add(new NoOpKeyCommand(0, 'o', PatchUtil.C.expandComment()));
@@ -938,7 +938,7 @@ public class SideBySide extends Screen {
     }
   }
 
-  private Runnable modifyInEditScreen(final CodeMirror cm) {
+  private Runnable openEditScreen(final CodeMirror cm) {
     return new Runnable() {
       @Override
       public void run() {

gerrit-gwtui/src/main/java/com/google/gerrit/client/patches/PatchConstants.java

@@ -58,7 +58,7 @@ public interface PatchConstants extends Constants {
   String toggleIntraline();
   String showPreferences();
 
-  String modifyInEditScreen();
+  String openEditScreen();
 
   String toggleReviewed();
   String markAsReviewedAndGoToNext();

gerrit-gwtui/src/main/java/com/google/gerrit/client/patches/PatchConstants.properties

@@ -40,8 +40,7 @@ toggleSideA = Toggle left side
 toggleIntraline = Toggle intraline difference
 showPreferences = Show diff preferences
 
-modifyInEditScreen = Modify in edit screen
-
+openEditScreen = Edit file in browser
 toggleReviewed = Toggle the reviewed flag
 markAsReviewedAndGoToNext = Mark patch as reviewed and go to next unreviewed patch