[UI/UX] [i18n] Comprehensive Arabic RTL improvements: Alignment, Missing Translations, and Dropdown Logic

Description

While testing the latest develop branch in Arabic (RTL), I identified several UI/UX inconsistencies and a functional bug in the Account Preferences and Sidebar menus. These issues affect the usability for RTL users.

Steps to reproduce

1. Set the language to Arabic.
2. Navigate to Account > Preferences.
3. Expand and then collapse the "General" (عام) section while a dropdown is open.
4. Open the Display Options menu from the Sidebar/Home header.

Observed Behavior

1. Functional Bug (Sticky Dropdown): In Account Preferences, opening a dropdown (e.g., "Do not ask me again list") and then collapsing its parent section causes the "Empty" placeholder to remain stuck/floating over other UI elements.
2. Icon & Text Overlap: In the Display Options menu, Arabic text labels (e.g., "النشاط", "الاسم") overlap with their corresponding icons due to lack of RTL-specific padding/margins.
3. Alignment Issues:
   • Numeric inputs (e.g., "Idle time limit") are Left-Aligned.
   • The "Empty" placeholder in dropdowns is Left-Aligned.
4. Missing Translations: Several keys remain in English, including "Account", "Accessibility & appearance", "Search rooms", and "Empty".

Expected Behavior

• Dropdown menus should unmount or close when their parent container is collapsed.
• Icons in RTL menus should have proper spacing to avoid overlapping with Arabic text.
• All numeric inputs and placeholders should respect RTL direction (Right-Aligned).
• All UI strings should be correctly mapped to their Arabic translations.

Screenshots / Videos

(Please attach the provided videos showing the sticky dropdown and screenshots showing the icon overlap here)

Environment

• Device: MacBook Air M1
• Browser: Chrome
• Rocket.Chat Version: 8.1.0-develop (latest)

I would like to work on this issue.

Please assign it to me.

https://github.com/user-attachments/assets/ef9b4073-a97e-45bb-91ba-f22471d73686

Start by reproducing the reported behavior in Arabic at Account > Preferences and in the Sidebar/Home header's Display Options menu. Check the sticky dropdown, icon spacing, input and placeholder alignment, and untranslated strings against the expected behavior; done means all four RTL and translation issues are resolved and the menus behave correctly when sections collapse.