wallets: Fix and improve links and descriptions

- DEX: Fix unintended removal of the Website link to
  https://dex.decred.org (fix #1147).

- DEX: Add "Setup guide" link. That wiki page is often recommended to
  newcomers so suggest it as the entry guide here.

- Decrediton: Add "Downloads" to the first link's label because it has
  extra options not listed in the quick/popular direct links.

- Decrediton: Remove confusing "GitHub" link. It should have been called
  "Source code" but the other panels don't link to source code, and
  the Decrediton panel is overcrowded compared to the others.

- CLI: Change first link to decred-binaries to prioritize it over
  decred-release and use the "Downloads and release notes" label.

- CLI: Change second link to decred-release and label it as
  "Installer (advanced)" to further indicate the user needs to double
  check it is the right option. This is to prevent users from
  downloading the wrong file.

- Use plural "Downloads" consistently.

- en.json: Update English strings to reflect the above changes and better
  introduce the apps. Only tweaking a few strings in this commit. More
  work could be done in future commits to help users choose between all
  the options.

src/data/wallets/wallets.yml

@@ -25,29 +25,31 @@
       platform: windl
       url: https://github.com/decred/decred-binaries/releases/download/v1.8.1/decrediton-v1.8.1.exe
       is_direct_download: true
-    - title: Release notes
+    - title: Downloads and release notes
       url: https://github.com/decred/decred-binaries/releases/tag/v1.8.1#user-content-decrediton-v181
-    - title: GitHub
-      url: https://github.com/decred/decrediton
 
 - id: dcrdex
   name: DCRDEX
   tags:
     - core_software
   highlight: true
   links:
-    - title: Download
+    - title: Downloads
       url: https://github.com/decred/dcrdex/releases/tag/v0.6.3
     - title: Release notes
       url: https://github.com/decred/dcrdex/blob/master/docs/release-notes/release-notes-0.6.3.md
+    - title: Website
+      url: https://dex.decred.org
+    - title: Setup guide
+      url: https://github.com/decred/dcrdex/wiki/Client-Installation-and-Configuration
 
 - id: cryptopower
   name: Cryptopower
   tags:
     - core_software
   highlight: true
   links:
-    - title: Download and release notes
+    - title: Downloads and release notes
       url: https://github.com/crypto-power/cryptopower/releases/tag/v1.0.0
     - title: Website
       url: https://cryptopower.dev
@@ -58,10 +60,10 @@
     - core_software
   highlight: true
   links:
-    - title: GitHub
+    - title: Downloads and release notes
+      url: https://github.com/decred/decred-binaries/releases/tag/v1.8.1
+    - title: Installer (advanced)
       url: https://github.com/decred/decred-release/releases/tag/v1.8.1
-    - title: Release notes
-      url: https://github.com/decred/decred-binaries/releases/tag/v1.8.1#user-content-dcrwallet-v181
 
 - id: trezor
   name: Trezor

transifex_catalogs/en.json

@@ -46,10 +46,10 @@
   "downloads_category_core_software": "Core software",
   "downloads_category_third_party_wallets": "3rd party wallets",
   "downloads_category_hardware_wallets": "Hardware wallets",
-  "downloads_app_decrediton": "Graphical UI wallet for Windows, macOS and Linux.",
-  "downloads_app_dcrdex": "Multi-coin light wallet with DEX support. No staking or advanced wallet features.",
-  "downloads_app_cryptopower": "Multi-coin light GUI wallet for DCR, BTC and LTC. Built purely in Go.",
-  "downloads_app_commandline": "A cross-platform, automatic installer/updater for the command-line applications.",
+  "downloads_app_decrediton": "Graphical UI wallet with all Decred features: staking, voting, Lightning Network, Trezor, DEX trading, and more. Runs on Windows, macOS and Linux.",
+  "downloads_app_dcrdex": "Multi-coin light wallet with peer-to-peer trustless trading and basic wallet features. DCR staking is coming. See the website for a list of assets and introduction.",
+  "downloads_app_cryptopower": "Multi-coin light GUI wallet for DCR, BTC and LTC. Built purely in Go. Windows, macOS, Linux and FreeBSD. Android and iOS are coming.",
+  "downloads_app_commandline": "Command-line full node daemon, wallet daemon, Lightning Network apps, politeiavoter, and more.",
   "downloads_app_mobilewallets": "Decred mobile wallets available for both Android and iOS platforms.",
   "downloads_app_exodus": "Exodus is a friendly, all-in-one application, to secure, manage and exchange blockchain assets.",
   "downloads_app_coinomi": "Securely store, manage and exchange Bitcoin, Ethereum, and more than 500 other blockchain assets.",