message: Updated Day header title color to not be OS constant (mac), closes
diff: <?xml version="1.0" encoding="UTF-8"?>
  -<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="13771" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES">
  +<document type="com.apple.InterfaceBuilder3.Cocoa.XIB" version="3.0" toolsVersion="14113" targetRuntime="MacOSX.Cocoa" propertyAccessControl="none" useAutolayout="YES">
  <dependencies>
  <deployment identifier="macosx"/>
  - <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="13771"/>
  + <plugIn identifier="com.apple.InterfaceBuilder.CocoaPlugin" version="14113"/>
  <capability name="box content view" minToolsVersion="7.0"/>
  <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
  </dependencies>
  </constraints>
  <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" alignment="left" title="Thu 22. Jan" id="Rk2-8z-I6y">
  <font key="font" metaFont="cellTitle"/>
  - <color key="textColor" name="disabledControlTextColor" catalog="System" colorSpace="catalog"/>
  + <color key="textColor" white="0.41999999999999998" alpha="1" colorSpace="calibratedWhite"/>
  <color key="backgroundColor" name="controlColor" catalog="System" colorSpace="catalog"/>
  </textFieldCell>
  </textField>
  </constraints>
  <textFieldCell key="cell" scrollable="YES" lineBreakMode="clipping" sendsActionOnEndEditing="YES" alignment="right" title="2 h 12 min" id="6GT-P9-Wsv">
  <font key="font" metaFont="smallSystem"/>
  - <color key="textColor" name="disabledControlTextColor" catalog="System" colorSpace="catalog"/>
  + <color key="textColor" white="0.41999999999999998" alpha="1" colorSpace="calibratedWhite"/>
  <color key="backgroundColor" name="textBackgroundColor" catalog="System" colorSpace="catalog"/>
  </textFieldCell>
  </textField>
  