Make patch testing a bit easier

Makefile

@@ -38,6 +38,10 @@ prediff: ## Create a copy of the files for reference when diffing
 diff: ## Create diffs for easier patching of languages later
 	./diff.sh
 
+prepatch: ## Reset the local copy to its reference Transifex state
+	rm -rf $(PWD)/edx-platform/locale
+	cp -a $(PWD)/edx-platform/locale_original $(PWD)/edx-platform/locale
+
 patch: ## Patch known issues on freshly downloaded translations
 	./patch.sh
 

README.md

@@ -29,10 +29,14 @@ Prepare for fixing:
 
     make fix
 
-Apply currently known fix. This might not work if changes were made in Transifex, in whcich case you'll need to edit the patch files manually.
+Apply currently known fix.
 
     make patch
 
+The above might not work if changes were made in Transifex. In that case, remove the failing hunks from the diff files, run the following command and try from the step above again until all patches are successfully applied.
+
+    make prepatch
+
 Detect remaining errors by running:
 
     make validate