Move modals and rename classes to match file names (#1367)

## Launch Checklist

I've created a folder for modals and moved them all inside.
I removed the icons which were small files with no real benefit and
moved the icons to where they were used.
I fixed an issue with the close button position in modal.
I've added missing translation to "Links" in debug modal.

Before: 

<img width="610" height="81" alt="image"
src="https://github.com/user-attachments/assets/dd7520f6-9634-4ff1-a83d-99ceae7c9144"
/>

After:
<img width="610" height="81" alt="image"
src="https://github.com/user-attachments/assets/fe3a2ccf-6c09-42ab-bf6f-dd30d3c68e13"
/>


 - [x] Briefly describe the changes in this PR.
- [x] Include before/after visuals or gifs if this PR includes visual
changes.
 - [ ] Add an entry to `CHANGELOG.md` under the `## main` section.

src/locales/ja/translation.json

@@ -89,6 +89,8 @@
   "Layer ID already exists": "レイヤーIDは既に存在します",
   "Debug": "デバッグ",
   "Options": "設定",
+  "Links": "リンク",
+  "<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>",
   "Save Style": "スタイルを保存",
   "Save the JSON style to your computer.": "JSONスタイルをコンピュータに保存します。",
   "Save as": "名前を付けて保存",
@@ -195,6 +197,5 @@
   "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"
 }