erp5_project: rename tabs name

Every project can have "Issues" - only IT projects can have bugs.

bt5/erp5_project/ActionTemplateItem/portal_types/Project%20Line/bug_list.xml

@@ -62,7 +62,7 @@
         </item>
         <item>
             <key> <string>title</string> </key>
-            <value> <string>Bugs</string> </value>
+            <value> <string>Issues</string> </value>
         </item>
         <item>
             <key> <string>visible</string> </key>

bt5/erp5_project/ActionTemplateItem/portal_types/Project/bug_list.xml

@@ -58,7 +58,7 @@
         </item>
         <item>
             <key> <string>title</string> </key>
-            <value> <string>Bugs</string> </value>
+            <value> <string>Issues</string> </value>
         </item>
         <item>
             <key> <string>visible</string> </key>