fix(i18n): overhaul Japanese translations, localise pending UI labels, and update documentation

- Overhaul Japanese translation catalogue and synchronize with current documentation
- Localise pending UI labels across dialogues, panels, and settings
- Add Japanese translation mapping for provisional LiveSync messages
- Update and refine all Japanese documentation files
- Strip weak ETag prefix in ObsHttpHandler for object storage compatibility

src/modules/features/Log/LogPane.svelte

@@ -58,7 +58,7 @@
                 <span>{msg("logPane.pause", {}, lang)}</span>
             </label>
             <span class="spacer"></span>
-            <button onclick={() => closeDialogue()}>Close</button>
+            <button onclick={() => closeDialogue()}>{msg("Close", {}, lang)}</button>
         </div>
     </div>
     <div class="log" bind:this={scroll}>