Lokalise: Translations update (#570)

* Lokalise: update of src/main/res/values/strings.xml

* Lokalise: update of src/main/res/values-de/strings.xml

* Lokalise: update of src/main/res/values-es/strings.xml

* Lokalise: update of src/main/res/values-fr/strings.xml

* Lokalise: update of src/main/res/values-ru/strings.xml

Merge pull request #558 from jorgeblacio/rate_me_add_no_thanks

Added a 'no thanks' to the rate me dialog. Also fixed a couple of bugs.

Merge pull request #555 from jorgeblacio/release_0_21_17

Various bug fixes for new release.

Merge pull request #554 from jorgeblacio/sign_in_form_fix

Now you can upload images in sign in form, also couple of fixes.

Merge pull request #553 from jorgeblacio/rate_fix

Fix rate me dialog that was appearing all the time.

Merge pull request #549 from jorgeblacio/release_0_21_13

Various bug fixes.

Merge pull request #546 from jorgeblacio/fix_mostaza

Fixed an issue with attching files when the max capacity per email exceeded.

Merge pull request #545 from jorgeblacio/release_0_21_11

Hotfix for release.

Merge pull request #543 from jorgeblacio/release_0_21_9

Final fix before release

real fix in the push notifications (#542)