Add template upload for approval controller

[GoebelL]

Changes in this Pull Request:

• template upload for approval controller

Mandatory checks:

• [x] latest changes were fetched from the upstream branch before creating this PR (branch is up to date)
• [x] changes were tested manually
• [ ] unit tests were properly implemented
• [ ] communication about interdependent changes has been sent to the team (if applicable)
• [ ] respective Jenkins jobs were referenced in additional context section of this PR

OSCM Build References: /view/Docker_OSCM/job/OSCM_Docker_Build_and_push/334/

Screenshot:

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This change is 

[codecov[bot]]

Codecov Report

Merging #111 (5bcf4da) into master (f9c8de0) will decrease coverage by 0.02%. The diff coverage is 29.41%.

@@            Coverage Diff             @@
##           master     #111      +/-   ##
==========================================
- Coverage   52.79%   52.77%   -0.03%     
==========================================
  Files         262      262              
  Lines       16699    16715      +16     
  Branches     2190     2191       +1     
==========================================
+ Hits         8817     8821       +4     
- Misses       7290     7301      +11     
- Partials      592      593       +1     

Impacted Files	Coverage Δ
...pp/approval/controller/ApprovalInstanceAccess.java	74.07% <25.00%> (-6.60%)	:arrow_down:
...main/java/org/oscm/app/common/ui/TemplateBean.java	64.64% <100.00%> (ø)