For the lang issues, replace your entire lang_inventory.php with this. Also feel free to change some of the text, as I've customized it for my site. As for your other issues, I can't really help there:
PHP Code:
<?php
//Language variables used for Inventory Page
$lang['inventory'] = "Here is the list of every item you own";
$lang['inventory_empty'] = "You currently do not have any items in your inventory.";
$lang['select_title'] = "Select a creature";
$lang['select'] = "Now you need to choose a creature to use this item:<br>";
$lang['item_error'] = "An error has occurred while manipulating item";
$lang['use_none'] = "It appears that you do not have this item in your inventory. <br /><br /> <a href='http://mysgardia.com/inventory'><button type='button'>Return to Inventory</button></a><br>";
$lang['use_fail'] = "It seems that item can not be used on the creature selected. <br /><br /> <a href='http://mysgardia.com/inventory'><button type='button'>Return to Inventory</button></a><br>";
$lang['use_effect'] = "The item refuses to take effect, what a waste of money and effort! <br /><br /> <a href='http://mysgardia.com/inventory'><button type='button'>Return to Inventory</button></a><br>";
$lang['sell_empty'] = "You have yet to specify the quantity of items to sell...<br /><br /> <a href='http://mysgardia.com/inventory'><button type='button'>Return to Inventory</button></a><br>";
$lang['sell_none'] = "It appears that you do not have this item in your inventory. <br /><br /> <a href='http://mysgardia.com/inventory'><button type='button'>Return to Inventory</button></a><br>";
$lang['sell_quantity'] = "It seems that you wish to sell more items than you already own, this action is invalid. <br /><br /> <a href='http://mysgardia.com/inventory'><button type='button'>Return to Inventory</button></a><br>";
$lang['sell'] = "You have sold ";
$lang['sell2'] = "successfully and earned some money back.<br /><br /> <a href='http://mysgardia.com/inventory'><button type='button'>Return to Inventory</button></a><br>";
$lang['toss_confirm'] = "Confirm your Action";
$lang['toss_warning'] = "Are you sure you wish to toss {$mysidia->input->post("itemname")}?<br>
It will be permanently removed from your inventory, and this action cannot be undone!<br>";
$lang['toss_none'] = "It appears that you do not have this item in your inventory. <br /><br /> <a href='http://mysgardia.com/inventory'><button type='button'>Return to Inventory</button></a><br>";
$lang['toss'] = "You have successfully removed ";
$lang['toss2'] = " from your inventory. <br /><br /> <a href='http://mysgardia.com/inventory'><button type='button'>Return to Inventory</button></a><br>";
$lang['alchemy_title'] = "Welcome to the Alchemy Service";
$lang['alchemy'] = "You come upon a quaint, older building in the middle of the Mysgardia Kingdom. You see various types of mages here, utilizing the workstations to magically craft powerful new items. A few of the Mysgardian Kingdom's forces stand idly by, keeping watch and discouraging anyone from stealing.<br /><br />";
$lang['alchemy_choose'] = " You select your first item:";
$lang['alchemy_choose2'] = "Then you select your second:";
$lang['alchemy_disabled'] = "Unfortunately the admin has disabled the Alchemy System for this site, you may send him/her a message for more information.<br /><br /> <a href='/inventory/alchemy'><button type='button'>Return</button></a>";
$lang['alchemy_success'] = "Congratulations!";
$lang['alchemy_newitem'] = "You have successfully produced a new item ";
$lang['alchemy_newitem2'] = " by using Alchemy. You may now manage it in your inventory, or continue to use the alchemy system.<br /><br />
<a href='/inventory/alchemy'><button type='button'>Return</button></a>";
$lang['alchemy_invalid'] = "The specified item combination is invalid, it does not produce a new item...<br /><br /> <a href='/inventory/alchemy'><button type='button'>Return</button></a>";
$lang['alchemy_empty'] = "You have not entered two valid items for performing alchemy.<br /><br /> <a href='/inventory/alchemy'><button type='button'>Return</button></a>";
$lang['alchemy_insufficient'] = "You do not have the necessary items for producing a new item through alchemy.<br /><br /> <a href='/inventory/alchemy'><button type='button'>Return</button></a>";
$lang['alchemy_chance'] = "The alchemy fails! How unfortunate, maybe you should try again?<br /><br /> <a href='/inventory/alchemy'><button type='button'>Return</button></a>";
$lang['alchemy_cost'] = "Apparently you do not have enough money to afford the alchemy service, please come back later.<br /><br /> <a href='/inventory/alchemy'><button type='button'>Return</button></a>";
$lang['alchemy_license'] = "You appear to lack the license required to perform alchemy, please make sure you have the license in your inventory first.<br /><br /> <a href='/inventory/alchemy'><button type='button'>Return</button></a>";
$lang['alchemy_recipe'] = "It seems that you do not have the recipe to produce an item from the two selected items.<br /><br /> <a href='/inventory/alchemy'><button type='button'>Return</button></a>";
$lang['alchemy_usergroup'] = "Unfortunately, the admin has specified that only certain users can perform alchemy, you may consult him/her by sending a message.<br /><br /> <a href='/inventory/alchemy'><button type='button'>Return</button></a>";
?>