Fix PDF locale and missing translations for ru/en

- Set app locale from user preference in PDF route before rendering
- Wrap hardcoded strings (TOTAL, Subtotal, Achitat etc.) with __()
- Translate status values via __() in blade
- Add ru/en translations: statuses, totals, payment lines

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

lang/en.json

@@ -60,6 +60,7 @@
     "Acest email a fost generat automat. Vă rugăm nu răspundeți.": "This email was auto-generated. Please do not reply.",
     "Achitat": "Paid",
     "Achitat azi": "Paid today",
+    "Achitat:": "Paid:",
     "Achiziție piese": "Parts purchase",
     "Achiziții": "Purchases",
     "Acord": "Agreed",
@@ -225,7 +226,7 @@
     "Approved at": "Approved at",
     "Aprilie": "April",
     "Aprobare": "Approval",
-    "Aprobare client": "Client agreement",
+    "Aprobare client": "Awaiting approval",
     "Aprobat": "Approved",
     "Aprobat de": "Approved by",
     "Aprobat de client": "Approved by client",
@@ -705,7 +706,7 @@
     "Diagnosis": "Diagnosis",
     "Diagnostic": "Diagnostic",
     "Diagnostic AI bazat pe plângerea clientului": "AI diagnosis based on the client complaint",
-    "Diagnosticare": "Diagnostics",
+    "Diagnosticare": "Diagnosis",
     "Diagnoza": "Diagnosis",
     "Diagnoză": "Diagnosis",
     "Diametru R": "Diameter R",
@@ -715,6 +716,7 @@
     "Disabled": "Disabled",
     "Discount": "Discount",
     "Discount %": "Discount %",
+    "Discount:": "Discount:",
     "Distribuie": "Distribute",
     "Distribuție": "Timing",
     "Doar active": "Active only",
@@ -1754,6 +1756,7 @@
     "Respins": "Rejected",
     "Respins de": "Rejected by",
     "Responsabil": "Assignee",
+    "Rest de achitat:": "Balance due:",
     "Rest de plată": "Balance due",
     "Restanță": "Debt",
     "Restaurează": "Restore",
@@ -1956,6 +1959,7 @@
     "Subtotal": "Subtotal",
     "Subtotal manopere:": "Labor subtotal:",
     "Subtotal piese:": "Parts subtotal:",
+    "Subtotal:": "Subtotal:",
     "Succes": "Success",
     "Sugerează revizie / piese de uzură.": "Suggest service / wear parts.",
     "Sugestii pe pagini:": "In-page hints:",
@@ -1984,6 +1988,7 @@
     "Săptămâna curentă": "Current week",
     "Săptămâna trecută": "Last week",
     "Săptămâni": "Weeks",
+    "TOTAL DE PLATĂ:": "TOTAL DUE:",
     "TPMS": "TPMS",
     "TPMS & foto": "TPMS & photos",
     "TVA": "VAT",