Add links to tile provider authentication docs (#914)

This probably confused some people in the past, since vector tiles won't
even display an access denied image ;)

Before (no information on access keys and where to get them):

<img width="411" alt="image"
src="https://github.com/user-attachments/assets/8820fb20-bda4-460c-9cc9-8fec5daa480d">

After (add links to providers in info callout + add a field for Stadia
Maps API keys):

<img width="395" alt="image"
src="https://github.com/user-attachments/assets/91ee732c-b3f5-45f8-81a6-8d896a93f644">

---------

Co-authored-by: Harel M <harel.mazor@gmail.com>
Co-authored-by: Joscha <34318751+josxha@users.noreply.github.com>
Co-authored-by: Hugues Tavernier <hugues.tavernier@protonmail.com>
Co-authored-by: Keitaroh Kobayashi <keita@kbys.me>

src/locales/ja/translation.json

@@ -34,7 +34,6 @@
   "Style Settings": "スタイル設定",
   "View": "表示",
   "Color accessibility": "色のアクセシビリティ",
-  "Language": "言語",
   "Help": "ヘルプ",
   "Comments for the current layer. This is non-standard and not in the spec.": "現在のレイヤーのコメント。注意：この機能は標準ではないため、他のライブラリとの互換性状況はわかりません。",
   "Comments": "コメント",
@@ -73,8 +72,8 @@
   "Collapse": "畳む",
   "Expand": "展開",
   "Add Layer": "レイヤー追加",
-  "Zoom:": "ズーム:",
   "Search": "検索",
+  "Zoom:": "ズーム:",
   "Close popup": "ポップアップを閉じる",
   "cursor:": "カーソル",
   "center:": "中央:",
@@ -82,7 +81,6 @@
   "Close modal": "モーダルを閉じる",
   "Debug": "デバッグ",
   "Options": "設定",
-  "<0>Open in OSM</0> &mdash; Opens the current view on openstreetmap.org": "現在のビューを <0>openstreetmap.org で開く</0>",
   "Export Style": "スタイルをエクスポート",
   "Download Style": "スタイルをダウンロード",
   "Download a JSON style to your computer.": "パソコンにJSONスタイルをダウンロードします。",
@@ -177,10 +175,15 @@
   "Error:": "エラー:",
   "MapTiler Access Token": "MapTiler アクセストークン",
   "Public access token for MapTiler Cloud.": "MapTiler Cloud の公開用アクセストークン",
+  "Learn More": "詳細はこちら",
   "Thunderforest Access Token": "Thunderforest アクセストークン",
   "Public access token for Thunderforest services.": "Thunderforest サービスの公開用アクセストークン",
+  "Stadia Maps API Key": "Stadia Maps API キー",
+  "API key for Stadia Maps.": "Stadia Maps の API キー",
   "Style Renderer": "スタイルレンダラ",
   "Choose the default Maputnik renderer for this style.": "このスタイルのデフォルトの Maputnik レンダラを選択してください",
+  "Language": "言語",
+  "<0>Open in OSM</0> — Opens the current view on openstreetmap.org": "現在のビューを <0>openstreetmap.org で開く</0>",
   "Layer options": "レイヤー設定",
   "Paint properties": "ペイントプロパティ",
   "Layout properties": "レイアウトプロパティ",