feat(i18n): wrap 1103 hardcoded UI strings across Filament with __()

- Convert static $modelLabel/$pluralModelLabel/$title to getter methods
- Wrap ->label()/->placeholder()/->helperText()/->description()/->title()/->body() args
- Wrap Section::make()/Fieldset::make()/Notification::make()->title() args
- Fix RelationManagers::getTitle() signature to match parent (Model, string)
- Fix Pages::getTitle() to instance method (BasePage::getTitle is non-static)
- Extend lang/ru.json + lang/en.json with 700+ common terms; identity fallback for the rest
- Remove duplicate getters in 5 resources that had manual getModelLabel already

All 306 tests pass. Missing translations fall back to the RO key so the UI never breaks.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

app/Filament/Central/Widgets/RecentTenants.php

@@ -17,7 +17,7 @@ class RecentTenants extends BaseWidget
     public function table(Table $table): Table
     {
         return $table
-            ->heading('Tenants recenți')
+            ->heading(__('Tenants recenți'))
             ->query(Company::query()->latest()->limit(8))
             ->columns([
                 Tables\Columns\TextColumn::make('slug')
@@ -33,8 +33,8 @@ class RecentTenants extends BaseWidget
                         default => 'gray',
                     }),
                 Tables\Columns\TextColumn::make('plan.name')->placeholder('—'),
-                Tables\Columns\TextColumn::make('users_count')->counts('users')->label('Useri'),
-                Tables\Columns\TextColumn::make('created_at')->label('Creat')->since(),
+                Tables\Columns\TextColumn::make('users_count')->counts('users')->label(__('Useri')),
+                Tables\Columns\TextColumn::make('created_at')->label(__('Creat'))->since(),
             ])
             ->paginated(false);
     }