Added possibility to specify translation contexts
What about introducing the use of msgctxt for ambiguous translations? So translators can better understand how to translate a text.
For example: 'To %s' may have two different translations when used as "Send to recipient" or as "End of a date interval".
The modified web/concrete/elements/permission/duration.php shows a possible implementation.
The translation of `%ss` doesn't make sense
The function `on_before_render()` of the concrete5_Controller_Dashboard_Workflow_Me class contains the code `t('%ss', …)`, where the … may be `Page`, `File` or `User`.
Anyway, with that code, translators have to literally translate `%ss`, which doesn't make sense: only in English plural forms are composed by adding an 's' after a word (and even in English this is not always true).
My solution is to translate every case.
Another, more elegant solution, would be to change the /web/concrete/config/install/base/permissions.xml file, adding a new xml attribute (let's call it `tabName`) containing the text for the tabs for each one of the `category` nodes of the `workflowprogresscategories` node. This implies we have to modify the function `importWorkflowProgressCategories()` of the /web/concrete/core/libraries/content/importer.php file and the `Concrete5_Model_WorkflowProgressCategory` class to manage this property.
Normalization of concrete5 name
There are some locations where concrete5 is written as Concrete5 (o just Concrete). This commit fix these, using always the lowercase "concrete5"
Avoid possible double page checkout

Let's hide the panel with the "Edit this Page" button
I've seen (even from myself) that users often click on the
Fix access denied message in sitemap selector

The page concrete/tools/sitemap_search_selector.php, when users don't
have access, says "Access Denied. You do not have access to sitemap
permissions". I think that users don't have access to the sitemap, not
to its permissions. Is that right?

As a minor change, I also splitted the two phrases in two different
sentences to be translated, so translators don't have to translate
the "Access Denied." part.
Add link to pages in Bulk SEO Updater

When managing seo fields in the Bulk SEO Updater, it's often useful to
take a look at the page.
Add link to pages in Bulk SEO Updater and fix css

When managing seo fields in the Bulk SEO Updater, it's often useful to
take a look at the page.
Translation made more consistent
Remove extra </span>
Add missing </label>
Fix closing <label> tag
Remove extra semicolon
Remove extra </td>
Add missing </optgroup>
Add missing </span>
Add missing </a>
Add missing </fieldset>
Add missing </label>, remove extra </a>
Add missing </strong>
Remove extra question mark