fix: Fix link filter for external urls

utils/link-filter.da.lua

@@ -1,6 +1,23 @@
 lang = "da"
 
+local function stringstarts(String,Start)
+  return string.sub(String,1,string.len(Start))==Start
+end
+
 function Link(el)
-  el.target = "/" .. lang .. el.target
-  return el
+  --[[
+    It runs these checks and if any succeed then it runs this action and returns the link, preventing the others from running.
+    1. Check if its a URL scheme, if so then change nothing
+    2. Check if its a ../ url, which means remove language parameter
+    3. Change URL irregardless
+  ]]--
+  if el.target:find('://') then
+    return el
+  elseif stringstarts(el.target, '../') then
+    el.target = el.target:sub(3)
+    return el
+  else 
+    el.target = "/" .. lang .. el.target
+    return el
+  end
 end

utils/link-filter.en.lua

@@ -1,6 +1,23 @@
 lang = "en"
 
+local function stringstarts(String,Start)
+  return string.sub(String,1,string.len(Start))==Start
+end
+
 function Link(el)
-  el.target = "/" .. lang .. el.target
-  return el
+  --[[
+    It runs these checks and if any succeed then it runs this action and returns the link, preventing the others from running.
+    1. Check if its a URL scheme, if so then change nothing
+    2. Check if its a ../ url, which means remove language parameter
+    3. Change URL irregardless
+  ]]--
+  if el.target:find('://') then
+    return el
+  elseif stringstarts(el.target, '../') then
+    el.target = el.target:sub(3)
+    return el
+  else 
+    el.target = "/" .. lang .. el.target
+    return el
+  end
 end

utils/link-filter.pt-BR.lua

@@ -1,6 +1,23 @@
 lang = "pt-BR"
 
+local function stringstarts(String,Start)
+  return string.sub(String,1,string.len(Start))==Start
+end
+
 function Link(el)
-  el.target = "/" .. lang .. el.target
-  return el
+  --[[
+    It runs these checks and if any succeed then it runs this action and returns the link, preventing the others from running.
+    1. Check if its a URL scheme, if so then change nothing
+    2. Check if its a ../ url, which means remove language parameter
+    3. Change URL irregardless
+  ]]--
+  if el.target:find('://') then
+    return el
+  elseif stringstarts(el.target, '../') then
+    el.target = el.target:sub(3)
+    return el
+  else 
+    el.target = "/" .. lang .. el.target
+    return el
+  end
 end