diff --git a/io_scene_psk_psa/i18n.py b/io_scene_psk_psa/i18n.py
index c1a1c45..7993e96 100644
--- a/io_scene_psk_psa/i18n.py
+++ b/io_scene_psk_psa/i18n.py
@@ -15,8 +15,13 @@ langs = {
         ('*', 'Select a PSA file'): 'PSAファイルを選択',
         ('*', 'Case Insensitive'): '大文字小文字を区別しない',
         ('*', 'All bones will be exported'): 'すべてのボーンがエクスポートされます',
-        ('*', 'Only bones belonging to the selected bone groups and their ancestors will be exported'):
+        ('*', 'Only bones belonging to the selected bone collections and their ancestors will be exported'):
             '選択したボーングループとその祖先に属するボーンのみがエクスポートされます',
         ('*', 'Raw Mesh Data'): '生のメッシュデータ',
+        ('*', 'At least one bone must be marked for export'): '少なくとも 1 つのボーンをエクスポート用にマークする必要があります',
+        ('*', 'Number of wedges ({wedge_count}) exceeds limit of {max_wedge_count}'): 'ウェッジの数({wedge_count})が{max_wedge_count}の制限を超えています',
+        ('*', 'Numbers of vertices ({point_count}) exceeds limit of {max_point_count}'): '頂点の数({point_count})が{max_point_count}の制限を超えています',
+        ('*', 'Number of materials ({material_count}) exceeds limit of {max_material_count}'): 'マテリアルの数({material_count})が{max_material_count}の制限を超えています',
+        ('*', 'Number of bones ({bone_count}) exceeds limit of {max_bone_count}'): 'ボーンの数({bone_count})が{max_bone_count}の制限を超えています',
     }
 }
diff --git a/io_scene_psk_psa/psk/export/operators.py b/io_scene_psk_psa/psk/export/operators.py
index 80e097f..814ed86 100644
--- a/io_scene_psk_psa/psk/export/operators.py
+++ b/io_scene_psk_psa/psk/export/operators.py
@@ -26,7 +26,9 @@ def populate_material_list(mesh_objects, material_list):
             material = material_slot.material
             # TODO: put this in the poll arg?
             if material is None:
-                raise RuntimeError('Material slot cannot be empty (index ' + str(i) + ')')
+                message = 'Material slot cannot be empty (index {index})'
+                message = bpy.app.translations.pgettext_iface(message.format(index=i))
+                raise RuntimeError(message)
             if material.name not in material_names:
                 material_names.append(material.name)
 
diff --git a/io_scene_psk_psa/psk/writer.py b/io_scene_psk_psa/psk/writer.py
index eec3234..dd528cd 100644
--- a/io_scene_psk_psa/psk/writer.py
+++ b/io_scene_psk_psa/psk/writer.py
@@ -1,6 +1,8 @@
 from ctypes import Structure, sizeof
 from typing import Type
 
+import bpy.app.translations
+
 from .data import Psk
 from ..data import Section, Vector3
 
@@ -24,15 +26,20 @@ def _write_section(fp, name: bytes, data_type: Type[Structure] = None, data: lis
 
 def write_psk(psk: Psk, path: str):
     if len(psk.wedges) > MAX_WEDGE_COUNT:
-        raise RuntimeError(f'Number of wedges ({len(psk.wedges)}) exceeds limit of {MAX_WEDGE_COUNT}')
+        message = bpy.app.translations.pgettext_iface('Number of wedges ({wedge_count}) exceeds limit of {MAX_WEDGE_COUNT}')
+        raise RuntimeError(message.format(wedge_count=len(psk.wedges), MAX_WEDGE_COUNT=MAX_WEDGE_COUNT))
     if len(psk.points) > MAX_POINT_COUNT:
-        raise RuntimeError(f'Numbers of vertices ({len(psk.points)}) exceeds limit of {MAX_POINT_COUNT}')
+        message = bpy.app.translations.pgettext_iface('Numbers of vertices ({point_count}) exceeds limit of {MAX_POINT_COUNT}')
+        raise RuntimeError(message.format(point_count=len(psk.points), MAX_POINT_COUNT=MAX_POINT_COUNT))
     if len(psk.materials) > MAX_MATERIAL_COUNT:
-        raise RuntimeError(f'Number of materials ({len(psk.materials)}) exceeds limit of {MAX_MATERIAL_COUNT}')
+        message = bpy.app.translations.pgettext_iface('Number of materials ({material_count}) exceeds limit of {MAX_MATERIAL_COUNT}')
+        raise RuntimeError(message.format(material_count=len(psk.materials), MAX_MATERIAL_COUNT=MAX_MATERIAL_COUNT))
     if len(psk.bones) > MAX_BONE_COUNT:
-        raise RuntimeError(f'Number of bones ({len(psk.bones)}) exceeds limit of {MAX_BONE_COUNT}')
+        message = bpy.app.translations.pgettext_iface('Number of bones ({bone_count}) exceeds limit of {MAX_BONE_COUNT}')
+        raise RuntimeError(message.format(bone_count=len(psk.bones), MAX_BONE_COUNT=MAX_BONE_COUNT))
     elif len(psk.bones) == 0:
-        raise RuntimeError(f'At least one bone must be marked for export')
+        message = bpy.app.translations.pgettext_iface('At least one bone must be marked for export')
+        raise RuntimeError(message)
 
     with open(path, 'wb') as fp:
         _write_section(fp, b'ACTRHEAD')