1.12.6 Stable

This is another bug fix release which resolves several usability problems.

Changes:

    * #658: Add confirmation dialog when adding duplicate subscription
      (dymoksc)

    * Fixes #689: When resuming from sleep feeds were being fetched
      before Wifi came up
      (ghost)
    * Fixes #685: Headerbar plugin "Mark All Read" button is not
      feed-specific
      (Robbie Cooper)
    * Fixes #549: Scrollbars not always present in the headline area
      (Leiaz)
    * Fixes #543: Next update overrides HTML5 enrichment
      (Lars Windolf)
    * Fixes overly wide label in enclosure preferences dialog
      (Lars Windolf)
    * Dropped unencrypted warning from auth dialog (not true anymore)
      (Lars Windolf)

    * #692: Update of Czech translation
      (RadimNo)
    * #688: Adding translatable tooltips for the headerbar plugin
      (Robbie Cooper)