replace deprecated classes, update code, fix errors, add missing stuff

po/en.po

@@ -1,15 +1,39 @@
-#: resources/window.blp:5 src/flashcardsappwin.c:28
+msgid ""
+msgstr ""
+"Project-Id-Version: flashcards\n"
+"Report-Msgid-Bugs-To: \n"
+"POT-Creation-Date: 2025-02-05 18:52+0100\n"
+"PO-Revision-Date: YEAR-MO-DA HO:MI+ZONE\n"
+"Last-Translator: FULL NAME <EMAIL@ADDRESS>\n"
+"Language-Team: LANGUAGE <LL@li.org>\n"
+"Language: \n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+
+#: resources/ui/window.blp:5 resources/ui/window.blp:54 src/flashcardsapp.c:42
 msgid "Flashcards"
 msgstr "Flashcards"
 
-#: resources/window.blp:20
-msgid "Topics"
-msgstr "Topics"
-
-#: resources/window.blp:94
-msgid "Upgrade Assistant"
+#: resources/ui/window.blp:17
+msgid "Categories"
 msgstr ""
 
-#: resources/window.blp:98
+#: resources/ui/window.blp:96
 msgid "About Flashcards"
 msgstr "About Flashcards"
+
+#: resources/ui/create-category.blp:9
+msgid "Cancel"
+msgstr ""
+
+#: resources/ui/create-category.blp:10
+msgid "Add"
+msgstr ""
+
+#: src/flashcardsapp.c:45
+msgid "translator-credits"
+msgstr ""
+
+#~ msgid "Topics"
+#~ msgstr "Topics"