i18n: improve translations across horilla (#1014)

- Added trans() / _() translations to models, forms and templates.
- Updated Spanish locale (django.po).
- Fixed missing verbose_name translations.

Known issues:
- "Leave Type" label in horilla/leave/forms.py not translating.
- "Performance" and "Mails automations" still pending.

helpdesk/models.py

@@ -5,7 +5,8 @@ from django import apps
 from django.db import models
 from django.db.models.signals import post_delete, post_save
 from django.forms import ValidationError
-from django.utils.translation import gettext_lazy as _
+from django.utils.translation import gettext as _
+from django.utils.translation import gettext_lazy as trans
 
 from base.horilla_company_manager import HorillaCompanyManager
 from base.models import Company, Department, JobPosition, Tags
@@ -16,31 +17,32 @@ from horilla_audit.methods import get_diff
 from horilla_audit.models import HorillaAuditInfo, HorillaAuditLog
 
 PRIORITY = [
-    ("low", "Low"),
-    ("medium", "Medium"),
-    ("high", "High"),
+    ("low", trans("Low")),
+    ("medium", trans("Medium")),
+    ("high", trans("High")),
 ]
+
 MANAGER_TYPES = [
-    ("department", "Department"),
-    ("job_position", "Job Position"),
-    ("individual", "Individual"),
+    ("department", trans("Department")),
+    ("job_position", trans("Job Position")),
+    ("individual", trans("Individual")),
 ]
 
 TICKET_TYPES = [
-    ("suggestion", "Suggestion"),
-    ("complaint", "Complaint"),
-    ("service_request", "Service Request"),
-    ("meeting_request", "Meeting Request"),
-    ("anounymous_complaint", "Anonymous Complaint"),
-    ("others", "Others"),
+    ("suggestion", trans("Suggestion")),
+    ("complaint", trans("Complaint")),
+    ("service_request", trans("Service Request")),
+    ("meeting_request", trans("Meeting Request")),
+    ("anounymous_complaint", trans("Anonymous Complaint")),
+    ("others", trans("Others")),
 ]
 
 TICKET_STATUS = [
-    ("new", "New"),
-    ("in_progress", "In Progress"),
-    ("on_hold", "On Hold"),
-    ("resolved", "Resolved"),
-    ("canceled", "Canceled"),
+    ("new", trans("New")),
+    ("in_progress", trans("In Progress")),
+    ("on_hold", trans("On Hold")),
+    ("resolved", trans("Resolved")),
+    ("canceled", trans("Canceled")),
 ]
 
 
@@ -74,9 +76,11 @@ class DepartmentManager(HorillaModel):
 
 
 class TicketType(HorillaModel):
-    title = models.CharField(max_length=100, unique=True, verbose_name=_("Title"))
-    type = models.CharField(choices=TICKET_TYPES, max_length=50, verbose_name=_("Type"))
-    prefix = models.CharField(max_length=3, unique=True, verbose_name=_("Prefix"))
+    title = models.CharField(max_length=100, unique=True, verbose_name=trans("Title"))
+    type = models.CharField(
+        choices=TICKET_TYPES, max_length=50, verbose_name=trans("Type")
+    )
+    prefix = models.CharField(max_length=3, unique=True, verbose_name=trans("Prefix"))
     company_id = models.ForeignKey(
         Company, null=True, editable=False, on_delete=models.PROTECT
     )
@@ -86,8 +90,8 @@ class TicketType(HorillaModel):
         return self.title
 
     class Meta:
-        verbose_name = _("Ticket Type")
-        verbose_name_plural = _("Ticket Types")
+        verbose_name = trans("Ticket Type")
+        verbose_name_plural = trans("Ticket Types")
 
 
 class Ticket(HorillaModel):
@@ -99,7 +103,7 @@ class Ticket(HorillaModel):
     ticket_type = models.ForeignKey(
         TicketType,
         on_delete=models.PROTECT,
-        verbose_name="Ticket Type",
+        verbose_name=trans("Ticket Type"),
     )
     description = models.TextField(max_length=255)
     priority = models.CharField(choices=PRIORITY, max_length=100, default="low")
@@ -112,7 +116,7 @@ class Ticket(HorillaModel):
     assigned_to = models.ManyToManyField(
         Employee, blank=True, related_name="ticket_assigned_to"
     )
-    deadline = models.DateField(null=True, blank=True)
+    deadline = models.DateField(null=True, blank=True, verbose_name=_("Deadline"))
     tags = models.ManyToManyField(Tags, blank=True, related_name="ticket_tags")
     status = models.CharField(choices=TICKET_STATUS, default="new", max_length=50)
     history = HorillaAuditLog(
@@ -242,8 +246,10 @@ class Attachment(HorillaModel):
 
 
 class FAQCategory(HorillaModel):
-    title = models.CharField(max_length=30)
-    description = models.TextField(blank=True, null=True, max_length=255)
+    title = models.CharField(max_length=30, verbose_name=trans("Title"))
+    description = models.TextField(
+        blank=True, null=True, max_length=255, verbose_name=trans("Description")
+    )
     company_id = models.ForeignKey(
         Company,
         null=True,