diff --git a/safeeyes/config/locale/ar/LC_MESSAGES/safeeyes.po b/safeeyes/config/locale/ar/LC_MESSAGES/safeeyes.po
index a6e7981..2ca905c 100644
--- a/safeeyes/config/locale/ar/LC_MESSAGES/safeeyes.po
+++ b/safeeyes/config/locale/ar/LC_MESSAGES/safeeyes.po
@@ -286,7 +286,7 @@ msgstr "تعبير الوظيفة المجدولة غير صحيح '%s'"
 # Settings dialog
 #, python-format
 msgid "Please add the resource %(resource)s to %(config_resource)s directory"
-msgstr "من فضلك أضف المورد %(resource)s إلى الدليل %(config_resource)"
+msgstr "من فضلك أضف المورد %(resource)s إلى الدليل %(config_resource)s"
 
 # Settings dialog
 msgid "New Break"
diff --git a/safeeyes/config/locale/da/LC_MESSAGES/safeeyes.po b/safeeyes/config/locale/da/LC_MESSAGES/safeeyes.po
index 5045138..7106d00 100644
--- a/safeeyes/config/locale/da/LC_MESSAGES/safeeyes.po
+++ b/safeeyes/config/locale/da/LC_MESSAGES/safeeyes.po
@@ -287,7 +287,7 @@ msgstr "Ugyldigt cron-udtryk '%s'"
 # Settings dialog
 #, python-format
 msgid "Please add the resource %(resource)s to %(config_resource)s directory"
-msgstr "Tilføj ressource %(ressource)s til %(config_resource)s bibliotek"
+msgstr "Tilføj ressource %(resource)s til %(config_resource)s bibliotek"
 
 # Settings dialog
 msgid "New Break"
diff --git a/safeeyes/config/locale/hu/LC_MESSAGES/safeeyes.po b/safeeyes/config/locale/hu/LC_MESSAGES/safeeyes.po
index ce79f1d..45c02dd 100644
--- a/safeeyes/config/locale/hu/LC_MESSAGES/safeeyes.po
+++ b/safeeyes/config/locale/hu/LC_MESSAGES/safeeyes.po
@@ -285,7 +285,7 @@ msgstr ""
 #, python-format
 msgid "Please add the resource %(resource)s to %(config_resource)s directory"
 msgstr ""
-"Kérem adja hozzá a(z) %(resource) erőforrást a %(config_resource) könyvtárhoz"
+"Kérem adja hozzá a(z) %(resource)s erőforrást a %(config_resource)s könyvtárhoz"
 
 # Settings dialog
 msgid "New Break"
diff --git a/safeeyes/config/locale/it/LC_MESSAGES/safeeyes.po b/safeeyes/config/locale/it/LC_MESSAGES/safeeyes.po
index cb52454..22dbca1 100644
--- a/safeeyes/config/locale/it/LC_MESSAGES/safeeyes.po
+++ b/safeeyes/config/locale/it/LC_MESSAGES/safeeyes.po
@@ -293,7 +293,7 @@ msgstr "Espressione cron non valida '%s'"
 #, python-format
 msgid "Please add the resource %(resource)s to %(config_resource)s directory"
 msgstr ""
-"Aggiungi la/le risorse %(resource) nella/e cartella/e %(config_resource)"
+"Aggiungi la/le risorse %(resource)s nella/e cartella/e %(config_resource)s"
 
 # Settings dialog
 msgid "New Break"
diff --git a/safeeyes/config/locale/pt/LC_MESSAGES/safeeyes.po b/safeeyes/config/locale/pt/LC_MESSAGES/safeeyes.po
index b9baf34..bc5504e 100644
--- a/safeeyes/config/locale/pt/LC_MESSAGES/safeeyes.po
+++ b/safeeyes/config/locale/pt/LC_MESSAGES/safeeyes.po
@@ -292,7 +292,7 @@ msgstr "A expressão cron '%s' é inválida"
 # Settings dialog
 #, python-format
 msgid "Please add the resource %(resource)s to %(config_resource)s directory"
-msgstr "Adicionar o recurso %(resource)s à pasta %(config_resources)s"
+msgstr "Adicionar o recurso %(resource)s à pasta %(config_resource)s"
 
 # Settings dialog
 msgid "New Break"
diff --git a/safeeyes/config/locale/pt_BR/LC_MESSAGES/safeeyes.po b/safeeyes/config/locale/pt_BR/LC_MESSAGES/safeeyes.po
index 5d79ac4..d528c42 100644
--- a/safeeyes/config/locale/pt_BR/LC_MESSAGES/safeeyes.po
+++ b/safeeyes/config/locale/pt_BR/LC_MESSAGES/safeeyes.po
@@ -294,7 +294,7 @@ msgstr "A expressão de cron '%s' é inválida"
 msgid "Please add the resource %(resource)s to %(config_resource)s directory"
 msgstr ""
 "Por favor, adicione o recurso %(resource)s para a diretoria "
-"%(config_resources)s"
+"%(config_resource)s"
 
 # Settings dialog
 msgid "New Break"
diff --git a/safeeyes/config/locale/ru/LC_MESSAGES/safeeyes.po b/safeeyes/config/locale/ru/LC_MESSAGES/safeeyes.po
index 1423ea4..e078fd6 100644
--- a/safeeyes/config/locale/ru/LC_MESSAGES/safeeyes.po
+++ b/safeeyes/config/locale/ru/LC_MESSAGES/safeeyes.po
@@ -290,7 +290,7 @@ msgstr "Недопустимое выражение cron '%s'"
 # Settings dialog
 #, python-format
 msgid "Please add the resource %(resource)s to %(config_resource)s directory"
-msgstr "Пожалуйста, добавьте источник %(resource)s в папку %(config_resource)"
+msgstr "Пожалуйста, добавьте источник %(resource)s в папку %(config_resource)s"
 
 # Settings dialog
 msgid "New Break"
diff --git a/safeeyes/config/locale/vi/LC_MESSAGES/safeeyes.po b/safeeyes/config/locale/vi/LC_MESSAGES/safeeyes.po
index eb79d94..fe2a14f 100644
--- a/safeeyes/config/locale/vi/LC_MESSAGES/safeeyes.po
+++ b/safeeyes/config/locale/vi/LC_MESSAGES/safeeyes.po
@@ -289,7 +289,7 @@ msgstr "Biểu thức cron '%s' không hợp lệ"
 # Settings dialog
 #, python-format
 msgid "Please add the resource %(resource)s to %(config_resource)s directory"
-msgstr "Vui lòng thêm tài nguyên %(resource) vào thư mục %(config_resource)"
+msgstr "Vui lòng thêm tài nguyên %(resource)s vào thư mục %(config_resource)s"
 
 # Settings dialog
 msgid "New Break"
diff --git a/safeeyes/config/locale/zh_CN/LC_MESSAGES/safeeyes.po b/safeeyes/config/locale/zh_CN/LC_MESSAGES/safeeyes.po
index d1a2747..01c69ef 100644
--- a/safeeyes/config/locale/zh_CN/LC_MESSAGES/safeeyes.po
+++ b/safeeyes/config/locale/zh_CN/LC_MESSAGES/safeeyes.po
@@ -287,7 +287,7 @@ msgstr "无效的 cron 正则表达式 '%s'"
 # Settings dialog
 #, python-format
 msgid "Please add the resource %(resource)s to %(config_resource)s directory"
-msgstr "请将资源 %(resource) 添加到 %(config_resource) 目录"
+msgstr "请将资源 %(resource)s 添加到 %(config_resource)s 目录"
 
 # Settings dialog
 msgid "New Break"
diff --git a/safeeyes/config/locale/zh_TW/LC_MESSAGES/safeeyes.po b/safeeyes/config/locale/zh_TW/LC_MESSAGES/safeeyes.po
index 7b18e46..65970b3 100644
--- a/safeeyes/config/locale/zh_TW/LC_MESSAGES/safeeyes.po
+++ b/safeeyes/config/locale/zh_TW/LC_MESSAGES/safeeyes.po
@@ -284,7 +284,7 @@ msgstr "無效的 cron 表述式 '%s'"
 # Settings dialog
 #, python-format
 msgid "Please add the resource %(resource)s to %(config_resource)s directory"
-msgstr "請將資源 %(resource)s 加入至 %(config_resource) 的路徑"
+msgstr "請將資源 %(resource)s 加入至 %(config_resource)s 的路徑"
 
 # Settings dialog
 msgid "New Break"
diff --git a/validate_po.py b/validate_po.py
index 6e64dda..8447cae 100644
--- a/validate_po.py
+++ b/validate_po.py
@@ -23,24 +23,84 @@ import polib
 import re
 import sys
 
-def has_equal_placeholders(left: str, right: str) -> bool:
-    percents = re.finditer(r'%(?P<name>\(\w+\))?(?P<format>[a-z])', left)
+def validate_placeholders(message: str) -> bool:
+    pos = 0
 
-    unnamed = defaultdict(int)
-    named = []
-    for percent in percents:
-        if percent.group('name'):
-            named.append(f"%({percent.group('name')}){percent.group('format')}")
-        else:
-            match = f"%{percent.group('format')}"
-            unnamed[match] += 1
+    success = True
+
+    count_placeholders = 0
+    count_unnamed = 0
+
+    while True:
+        index = message.find("%", pos)
+        if index == -1:
+            break
+
+        pos = index + 1
+
+        nextchar = message[pos : pos + 1]
+
+        name = None
+
+        if nextchar == "(":
+            index = message.find(")", pos)
+            if index == -1:
+                success = False
+                print(f"Unclosed parenthetical in '{message}'")
+                break
+            name = message[pos + 1 : index]
+
+            pos = index + 1
+
+        nextchar = message[pos : pos + 1]
+        if nextchar not in ["%", "s", "d", "i", "f", "F"]:
+            success = False
+            print(f"Invalid format modifier in '{message}'")
+            break
+
+        if nextchar != "%":
+            count_placeholders += 1
+            if name is None:
+                count_unnamed += 1
+
+        pos += 1
+        continue
+
+    if count_unnamed > 1:
+        success = False
+        print(f"Multiple unnamed placeholders in '{message}'")
+
+    if count_unnamed > 0 and count_placeholders > count_unnamed:
+        success = False
+        print(f"Mixing named and unnamed placeholders in '{message}'")
+
+    return success
+
+def has_equal_placeholders(left: str, right: str) -> bool:
+    def _get_placeholders(message: str) -> tuple:
+        percents = re.finditer(r"%(?P<name>\(\w+\))?(?P<format>[a-z])", message)
+
+        unnamed = defaultdict(int)
+        named = set()
+        for percent in percents:
+            if percent.group("name"):
+                named.add(f"%({percent.group('name')}){percent.group('format')}")
+            else:
+                match = f"%{percent.group('format')}"
+                unnamed[match] += 1
+        return (unnamed, named)
+
+    (left_unnamed, left_named) = _get_placeholders(left)
+    (right_unnamed, right_named) = _get_placeholders(right)
 
     # count unnamed cases (eg. %s, %d)
-    for match, count in unnamed.items():
-        if right.count(match) != count:
+    for match, count in left_unnamed.items():
+        if right_unnamed.get(match, 0) != count:
             return False
 
-    # no need to count named cases - they are optional
+    # named cases are optional - but ensure that translation does not add new ones
+    if not right_named.issubset(left_named):
+        return False
 
     return True
 
@@ -48,17 +108,23 @@ def validate_po(locale: str, path: str) -> bool:
     success = True
     po = polib.pofile(path)
     for entry in po:
-        if entry.msgstr and not has_equal_placeholders(entry.msgid, entry.msgstr):
-            print("Number of variables mismatched in " + locale)
-            print(entry.msgid + " -> " + entry.msgstr)
-            print()
-            success = False
-        for plural in entry.msgstr_plural.values():
-            if plural and not has_equal_placeholders(entry.msgid, plural):
+        if entry.msgstr:
+            if not validate_placeholders(entry.msgstr):
+                success = False
+            if not has_equal_placeholders(entry.msgid, entry.msgstr):
                 print("Number of variables mismatched in " + locale)
-                print(entry.msgid + " -> " + plural)
+                print(entry.msgid + " -> " + entry.msgstr)
                 print()
                 success = False
+        for plural in entry.msgstr_plural.values():
+            if plural:
+                if not validate_placeholders(plural):
+                    success = False
+                if not has_equal_placeholders(entry.msgid, plural):
+                    print("Number of variables mismatched in " + locale)
+                    print(entry.msgid + " -> " + plural)
+                    print()
+                    success = False
     return success
 
 success = True