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 "GitHub" link to "Download installer".

- CLI: Add "Installer guide" link which explains what will be installed
  and where.

- CLI: Change last link to "Release notes + standalone" to indicate that
  it is a second download/install option.

- 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 +60,12 @@
     - core_software
   highlight: true
   links:
-    - title: GitHub
+    - title: Download installer
       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
+    - title: Installer guide
+      url: https://docs.decred.org/wallets/cli/cli-installation/
+    - title: Release notes + standalone
+      url: https://github.com/decred/decred-binaries/releases/tag/v1.8.1
 
 - 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": "Full node daemon, wallet daemon, Lightning Network tools, politeiavoter, and more. Use the automatic installer/updater or install the standalone binaries manually.",
   "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.",