Added transparent to widget color dialog

app/src/main/java/eu/faircode/email/ActivityWidget.java

@@ -120,9 +120,10 @@ public class ActivityWidget extends ActivityBase {
                                 setBackground();
                             }
                         })
-                        .setNegativeButton(R.string.title_reset, new DialogInterface.OnClickListener() {
+                        .setNegativeButton(R.string.title_transparent, new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
+                                cbSemiTransparent.setChecked(false);
                                 btnColor.setColor(Color.TRANSPARENT);
                                 setBackground();
                             }

app/src/main/java/eu/faircode/email/ActivityWidgetSync.java

@@ -84,9 +84,10 @@ public class ActivityWidgetSync extends ActivityBase {
                                 btnColor.setColor(selectedColor);
                             }
                         })
-                        .setNegativeButton(R.string.title_reset, new DialogInterface.OnClickListener() {
+                        .setNegativeButton(R.string.title_transparent, new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
+                                cbSemiTransparent.setChecked(false);
                                 btnColor.setColor(Color.TRANSPARENT);
                             }
                         })

app/src/main/java/eu/faircode/email/ActivityWidgetUnified.java

@@ -118,9 +118,10 @@ public class ActivityWidgetUnified extends ActivityBase {
                                 btnColor.setColor(selectedColor);
                             }
                         })
-                        .setNegativeButton(R.string.title_reset, new DialogInterface.OnClickListener() {
+                        .setNegativeButton(R.string.title_transparent, new DialogInterface.OnClickListener() {
                             @Override
                             public void onClick(DialogInterface dialog, int which) {
+                                cbSemiTransparent.setChecked(false);
                                 btnColor.setColor(Color.TRANSPARENT);
                             }
                         })

app/src/main/res/values/strings.xml

@@ -680,6 +680,7 @@
     <string name="title_account_interval_hint">Frequency of refreshing the connection for push messages or frequency of checking for new messages</string>
     <string name="title_account_partial_fetch_hint">Disable this only in case of empty messages or corrupt attachments</string>
     <string name="title_color">Color</string>
+    <string name="title_transparent">Transparent</string>
     <string name="title_account_ondemand">Synchronize manually</string>
     <string name="title_account_notify">Separate notifications</string>
     <string name="title_account_left">Swipe left</string>