diff --git a/.luacheckrc b/.luacheckrc
index e5476e67f..5797babbc 100644
--- a/.luacheckrc
+++ b/.luacheckrc
@@ -116,4 +116,10 @@ files["spec/unit/*"].globals = {
 }
 
 -- TODO: clean up and enforce max line width (631)
-ignore = {"631"}
+-- https://luacheck.readthedocs.io/en/stable/warnings.html
+-- 211 - Unused local variable
+-- 631 - Line is too long
+ignore = {
+    "211/__*",
+    "631",
+}
diff --git a/frontend/apps/filemanager/filemanagerconverter.lua b/frontend/apps/filemanager/filemanagerconverter.lua
index fb4f763de..aaf7ab66e 100644
--- a/frontend/apps/filemanager/filemanagerconverter.lua
+++ b/frontend/apps/filemanager/filemanagerconverter.lua
@@ -8,13 +8,13 @@ local UIManager = require("ui/uimanager")
 local lfs = require("libs/libkoreader-lfs")
 local logger = require("logger")
 local util = require("util")
-local gettext = require("gettext")
+local _ = require("gettext")
 local T = require("ffi/util").template
 
 local FileConverter = {
     formats_from = {
         md = {
-            name = gettext("Markdown"),
+            name = _("Markdown"),
             from = "markdown",
         },
     },
@@ -70,23 +70,23 @@ function FileConverter:isSupported(file)
 end
 
 function FileConverter:showConvertButtons(file, ui)
-    local _, filename_pure = util.splitFilePathName(file)
+    local __, filename_pure = util.splitFilePathName(file)
     local filename_suffix = util.getFileNameSuffix(file)
     local filetype_name = self.formats_from[filename_suffix].name
     self.convert_dialog = ButtonDialogTitle:new{
-        title = T(gettext("Convert %1 to:"), filetype_name),
+        title = T(_("Convert %1 to:"), filetype_name),
         buttons = {
             {
                 {
-                    text = gettext("HTML"),
+                    text = _("HTML"),
                     callback = function()
                         local html = FileConverter:_mdFileToHtml(file, filename_pure)
                         if not html then return end
                         local filename_html = file..".html"
                         if lfs.attributes(filename_html, "mode") == "file" then
                             UIManager:show(ConfirmBox:new{
-                                text = gettext("Overwrite existing HTML file?"),
-                                ok_text = gettext("Overwrite"),
+                                text = _("Overwrite existing HTML file?"),
+                                ok_text = _("Overwrite"),
                                 ok_callback = function()
                                     FileConverter:writeStringToFile(html, filename_html)
                                     UIManager:close(self.convert_dialog)
diff --git a/frontend/document/documentregistry.lua b/frontend/document/documentregistry.lua
index b1421786e..66e412986 100644
--- a/frontend/document/documentregistry.lua
+++ b/frontend/document/documentregistry.lua
@@ -5,10 +5,10 @@ This is a registry for document providers
 local ConfirmBox = require("ui/widget/confirmbox")
 local OpenWithDialog = require("ui/widget/openwithdialog")
 local UIManager = require("ui/uimanager")
-local gettext = require("gettext")
 local logger = require("logger")
 local lfs = require("libs/libkoreader-lfs")
 local util = require("util")
+local _ = require("gettext")
 local T = require("ffi/util").template
 
 local DocumentRegistry = {
@@ -148,14 +148,14 @@ function DocumentRegistry:setProvider(file, provider, all)
 end
 
 function DocumentRegistry:showSetProviderButtons(file, filemanager_instance,  ui, reader_ui)
-    local _, filename_pure = util.splitFilePathName(file)
+    local __, filename_pure = util.splitFilePathName(file)
     local filename_suffix = util.getFileNameSuffix(file)
 
     local buttons = {}
     local radio_buttons = {}
     local providers = self:getProviders(file)
 
-    for _, provider in ipairs(providers) do
+    for ___, provider in ipairs(providers) do
         -- we have no need for extension, mimetype, weights, etc. here
         provider = provider.provider
         table.insert(radio_buttons, {
@@ -169,13 +169,13 @@ function DocumentRegistry:showSetProviderButtons(file, filemanager_instance,  ui
 
     table.insert(buttons, {
         {
-            text = gettext("Cancel"),
+            text = _("Cancel"),
             callback = function()
                 UIManager:close(self.set_provider_dialog)
             end,
         },
         {
-            text = gettext("Open"),
+            text = _("Open"),
             is_enter_default = true,
             callback = function()
                 local provider = self.set_provider_dialog.radio_button_table.checked_button.provider
@@ -183,9 +183,9 @@ function DocumentRegistry:showSetProviderButtons(file, filemanager_instance,  ui
                 -- always for this file
                 if self.set_provider_dialog._check_file_button.checked then
                     UIManager:show(ConfirmBox:new{
-                        text = T(gettext("Always open '%2' with %1?"),
+                        text = T(_("Always open '%2' with %1?"),
                                          provider.provider_name, filename_pure),
-                        ok_text = gettext("Always"),
+                        ok_text = _("Always"),
                         ok_callback = function()
                             self:setProvider(file, provider, false)
 
@@ -197,9 +197,9 @@ function DocumentRegistry:showSetProviderButtons(file, filemanager_instance,  ui
                 -- always for all files of this file type
                 elseif self.set_provider_dialog._check_global_button.checked then
                     UIManager:show(ConfirmBox:new{
-                        text = T(gettext("Always open %2 files with %1?"),
+                        text = T(_("Always open %2 files with %1?"),
                                          provider.provider_name, filename_suffix),
-                        ok_text = gettext("Always"),
+                        ok_text = _("Always"),
                         ok_callback = function()
                             self:setProvider(file, provider, true)
 
@@ -219,7 +219,7 @@ function DocumentRegistry:showSetProviderButtons(file, filemanager_instance,  ui
     })
 
     self.set_provider_dialog = OpenWithDialog:new{
-        title = T(gettext("Open %1 with:"), filename_pure),
+        title = T(_("Open %1 with:"), filename_pure),
         radio_buttons = radio_buttons,
         buttons = buttons,
     }