[instrument_list] Translates Instrument list module.

[racostas]

• Translates Instrument list module
• Spanish language was use for demonstration purposes only. ( Also the only Spanish translations included in the loris.po file were the ones used in this module -- for simplicity and speeding the process)
• some entries were added to the general loris.pot file since they are used in other modules as well.
• Breadcrumb are not translated in this PR since they came from other two modules candidate_list and candidate_profile respectively

[driusan]

The "Imaging Scan Done" column in the header is showing "Y" or "N" instead of the translated "Yes" or "No" string.

I adapted this patch from the timepoint list to fix it:

diff --git a/modules/instrument_list/templates/menu_instrument_list.tpl b/modules/instrument_list/templates/menu_instrument_list.tpl
index ca0770747..46992abec 100644
--- a/modules/instrument_list/templates/menu_instrument_list.tpl
+++ b/modules/instrument_list/templates/menu_instrument_list.tpl
@@ -109,7 +109,18 @@
         {$display.CohortTitle}
       </td>
       <td>
-        {$display.Scan_done|default:"<img alt=\"Data Missing\" src=\"{$baseurl|default}/images/help2.gif\" width=\"12\" height=\"12\" />"}
+        {if $display.Scan_done != ""}
+                {if $display.Scan_done == 'Y'}
+                    {assign var="scan_done" value=dgettext("loris", "Yes")}
+                    <a href="{$baseurl|default}/imaging_browser/viewSession/?sessionID={$sessionID}" class="timepoint_list">
+                    {$scan_done}</a>
+                {else}
+                    {assign var="scan_done" value={dgettext("loris", "No")}}
+                    {$scan_done}
+                {/if}
+        {else}
+            <img alt="Data Missing" src="{$baseurl|default}/images/help2.gif" border=0>
+        {/if}
       </td>
       <td>
         {if $display.WindowInfo.Optimum|default}