Add-ons server

• Added basic command line options.
• Add-on validation status responses can now be translated by the client.
• Fixed an issue where incremental downloads would always transmit a delta for updating from the very earliest available version of an add-on to the very latest, instead of using the current and target versions specified by the client.
• Incremental downloads are no longer allowed to cheat the download counts.

Add-ons client

• It is now possible to install previous versions of an add-on if present and not expired on the server.

Campaigns

• A Tale of Two Brothers:
  • S02: Changed the antagonists' motive and dialogue to sound more believable

• Secrets of the Ancients:
  • Revisions to Bone Captain
  • Scenario 2 uses new Iron Fence terrain, in preparation for potential map revisions.
  • While the two leaders are separated, only the currently active one learns new zombie types.

• Sceptre of Fire:
  • Scenario 2p5: increased the turn limit by 1 and enhanced victory filter conditions
  • Scenario 4: fixed a bug that prevented resources from spawning and added some small flavor adjustments
  • Some revisions/bugfixes to Scenario 9 "Caverns of Flame"

Multiplayer

• During allies' turns, use orb colors to show which ones can still move (issue #1424). Also enabled for allied AI sides in singleplayer.

Terrain

• New barrier terrain: Iron Fence (`^Eqf`) - similar layout to the existing wooden fence

Translations

• Updated translations: British English, Catalan, Polish, Portuguese (Brazil)

Units

• Decreased Icemonax's advancement XP requirement from 26 to 25 to match other dead-end L0 units.
• Portrait and animation graphics for some of the new Wesnoth Fauna
• Balancing:
  • Dune Rider xp changed from 42 to 47.
  • Sunderer line defense on hills changed from 60% to 50%.
  • Scorcher gold cost changed from 23 to 25.
  • Dragoon gold cost changed from 27 to 28.
  • Elvish Rider gold cost changed from 32 to 28.

User interface

• Added the installable/upgradable version selection to the add-ons manager via a dropdown list
• Fixed formatting of hyperlinks when the same URL appears more than once in a block of text

Miscellaneous and Bug Fixes

• Fixed a rare issue on Windows that could result in wesnoth.exe sticking around waiting for console input after encountering an error despite not being launched with the `--wconsole` option.
• Fixed a potential crash when drawing many images on the story screens.
• Fixed the schema's list of attributes supported by IntroWML.
• Fixed and renamed IntroWML's `[image]resize_with_background=yes` to keep images proportional to the background.
• Fixed precise log timestamps missing a space between the timestamp and the log severity label.
• Improve the in-game help's topic about orbs, add crowns and ellipses.
• Removed documentation for network proxy-related command line options previously removed in version 1.13.1 along with libana.