Fixed some spelling errors

lang/en/help/workshop/anonymous.html

@@ -3,7 +3,7 @@
 <p>A peer graded assignment can be graded anonymously. In this
 	case the names (and any photos) of the students doing the grading 
 	are not shown. Only the (file) names of the submissions are used to identify
-	the peices of work being graded. </p>
+	the pieces of work being graded. </p>
 
 <p>When the peer graded assignment is not graded anonymously, the 
 	pieces of work are shown with the names (and any photos) of the 

lang/en/help/workshop/calculatingfinalgrade.html

@@ -6,11 +6,11 @@
 <ol>
 <li>The teacher's grade for their submitted work. This is optional and will be
 	used if the teacher actually assesses the student's work. If the student submits 
-	more than one peice of work the &quot;best&quot; grade is used. Here, best 
+	more than one piece of work the &quot;best&quot; grade is used. Here, best 
 	means the piece of work with the highest weighted combination of teacher's
 	grade and peer grade...</li>
 <li>The average of the peer grades for their submitted work. Again if the student
-	submits more than one peice of work the &quot;best&quot; grade is used. The
+	submits more than one piece of work the &quot;best&quot; grade is used. The
 	peer grade can optionally
 	include the teacher's grade. This grade would be included if the number of
 	peer gradings is very low or it is thought that the peer gradings are suspect 
@@ -23,10 +23,10 @@
 	averages for each of the submissions they assessed. In general this component
 	should NOT be given a high weighting.</li>
 <li>The student's reliability in grading peer work. This is a measure on how well
-	a students grades follow the peer average for the peices of work they 
+	a students grades follow the peer average for the pieces of work they 
 	assessed. The measure discounts the student bias and averages the absolute 
 	differences between their grades and the peer average grades. In theory if
-	the students gives high marks for good peices of work and low marks for poor 
+	the students gives high marks for good pieces of work and low marks for poor 
 	pieces of work their reliability will be high. If it is suspected that the students in
 	general are poor assessors then the teacher's grades should be included into
 	the ppeer averages, this should make the reliability values more meaningful.

lang/en/help/workshop/grading.html

@@ -16,7 +16,7 @@
 
 <p>In other type of asessments, you are asked to determine if various items
 	are present or absent, in others you are asked to choose which statement best 
-	fits the peice of work. In both of these assignments you can adjust the grade
+	fits the piece of work. In both of these assignments you can adjust the grade
 	somewhat as you see fit.</p>
 
 <p>The last box on this form allows you to make a general comment on the 

lang/en/help/workshop/gradingassessments.html

@@ -19,6 +19,6 @@
 	time has elapsed the teacher's comment is made available to the student. The 
 	"grading grade", however, is not revealed to the student until the
 	final grades are made available. (The reason for this is the likely confusion 
-	between the grade for the peice of work and the grade for the ASSESSMENT 
+	between the grade for the piece of work and the grade for the ASSESSMENT 
 	of that work, at an early stage of an assignment the distinction will not be 
 	clear to students.)</p>

lang/en/help/workshop/nattachments.html

@@ -1,7 +1,7 @@
 <p align="center"><b>Number of Attachment expected on Submissions</b></p>
 
 <p>The number entered here determines how many &quot;upload boxes&quot; are 
-    shown when the student submits a peice of work. The number can be zero, 
+    shown when the student submits a piece of work. The number can be zero, 
     that is no attachments are allowed. If attachments are expected, the number
     is set to 1, 2, up to 5. Normally the number will be 0 or 1, but in some 
     assignments the students may be asked to submit more than one attachment.</p>