Small layout improvements

app/src/main/res/layout/include_message_navigation.xml

@@ -365,7 +365,8 @@
             android:tooltipText="@string/title_verify"
             app:layout_constraintEnd_toStartOf="@+id/ibDecrypt"
             app:layout_constraintTop_toBottomOf="@id/vSeparator"
-            app:srcCompat="@drawable/twotone_gesture_24" />
+            app:srcCompat="@drawable/twotone_gesture_24"
+            app:tint="?attr/colorAccent" />
 
         <ImageButton
             android:id="@+id/ibDecrypt"
@@ -379,7 +380,8 @@
             android:tooltipText="@string/title_decrypt"
             app:layout_constraintEnd_toStartOf="@+id/ibImages"
             app:layout_constraintTop_toBottomOf="@id/vSeparator"
-            app:srcCompat="@drawable/twotone_lock_open_24" />
+            app:srcCompat="@drawable/twotone_lock_open_24"
+            app:tint="?attr/colorAccent" />
 
         <ImageButton
             android:id="@+id/ibImages"
@@ -393,7 +395,8 @@
             android:tooltipText="@string/title_legend_show_images"
             app:layout_constraintEnd_toStartOf="@+id/ibFull"
             app:layout_constraintTop_toBottomOf="@id/vSeparator"
-            app:srcCompat="@drawable/twotone_image_24" />
+            app:srcCompat="@drawable/twotone_image_24"
+            app:tint="?attr/colorAccent" />
 
         <ImageButton
             android:id="@+id/ibFull"
@@ -406,14 +409,15 @@
             android:tooltipText="@string/title_legend_show_full"
             app:layout_constraintEnd_toEndOf="parent"
             app:layout_constraintTop_toBottomOf="@id/vSeparator"
-            app:srcCompat="@drawable/twotone_fullscreen_24" />
+            app:srcCompat="@drawable/twotone_fullscreen_24"
+            app:tint="?attr/colorAccent" />
     </androidx.constraintlayout.widget.ConstraintLayout>
 
     <eu.faircode.email.FixedTextView
         android:id="@+id/tvReformatted"
         android:layout_width="0dp"
         android:layout_height="wrap_content"
-        android:paddingBottom="12dp"
+        android:paddingVertical="6dp"
         android:text="@string/title_reformatted"
         android:textAppearance="@style/TextAppearance.AppCompat.Small"
         android:textStyle="italic"
@@ -426,7 +430,7 @@
         android:layout_width="0dp"
         android:layout_height="wrap_content"
         android:gravity="center"
-        android:paddingBottom="12dp"
+        android:paddingVertical="6dp"
         android:text="@string/title_signed_data"
         android:textAppearance="@style/TextAppearance.AppCompat.Small"
         android:textStyle="italic"