[Imagine plug 1.3] spelling corrected of Javascript methods

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | -
| Fixed tickets | -
| Refs tickets  | -
| License       | MIT
| Doc PR        | -

In Branch 1.3 as well method names were spelled as Perset instead of Preset
Merge pull request #1646 from espaan/patch-2

This PR was merged into zikula:1.3 branch.

Discussion
----------

[Imagine plug 1.3] spelling corrected of Javascript methods

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | -
| Fixed tickets | -
| Refs tickets  | -
| License       | MIT
| Doc PR        | -

In Branch 1.3 as well method names were spelled as Perset instead of Preset

Commits
-------

1df3c5781504e1e86dbfb39773cdaf2986998c30 [Imagine plug 1.3] spelling corrected of Javascript methods

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | -
| Fixed tickets | -
| Refs tickets  | -
| License       | MIT
| Doc PR        | -

In Branch 1.3 as well method names were spelled as Perset instead of Preset espaan