diff --git a/dzgui/strings/errors.py b/dzgui/strings/errors.py
new file mode 100644
index 0000000..bc5c5fd
--- /dev/null
+++ b/dzgui/strings/errors.py
@@ -0,0 +1,3 @@
+api_validation_error = (
+    "API key validation error. Key was typed incorrectly or is defunct."
+)
diff --git a/dzgui/strings/server_mods.py b/dzgui/strings/server_mods.py
new file mode 100644
index 0000000..c1a3106
--- /dev/null
+++ b/dzgui/strings/server_mods.py
@@ -0,0 +1,4 @@
+mod = "Mod"
+mod_id = "ID"
+installed = "Installed"
+modlist = "Modlist"