docs: Add issue templates

.gitea/ISSUE_TEMPLATE/bug.yaml

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+name: Bug report
+about: File a bug report
+labels:
+  - Bug
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report! Please provide a short, but a descriptive title for your issue.
+  - type: textarea
+    id: expected-behaviour
+    attributes:
+      label: Expected Behavior
+      description: What did you expect to happen?
+    validations:
+      required: true
+  - type: textarea
+    id: actual-behaviour
+    attributes:
+      label: Actual Behavior
+      description: What actually happened?
+    validations:
+      required: true
+  - type: textarea
+    id: steps-to-reproduce
+    attributes:
+      label: Steps to Reproduce
+      description: What steps can we follow to reproduce this issue?
+      placeholder: |
+        1. First step
+        2. Second step
+        3. and so on...
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Context and notes
+      description: Additional information about environment or what were you trying to do. If you have an idea how to fix this issue, please describe it here too.
+  - type: textarea
+    id: logs
+    attributes:
+      label: Relevant log output
+      description: Please copy and paste any relevant log output, if you have any. This will be automatically formatted into code, so no need for backticks.
+      render: shell
+  - type: input
+    id: app-version
+    attributes:
+      label: App Version
+      description: What version of SelfPrivacy app are you running? You can find it in the "About" section of the app.
+    validations:
+      required: true
+  - type: input
+    id: api-version
+    attributes:
+      label: Server API Version
+      description: What version of SelfPrivacy API are you running? You can find it in the "About" section of the app. Leave it empty, if your app is not connected to the server yet.
+  - type: dropdown
+    id: os
+    attributes:
+      label: Operating System
+      description: What operating system are you using?
+      options:
+        - Android
+        - iOS
+        - Linux
+        - macOS
+        - Windows

.gitea/ISSUE_TEMPLATE/feature.yaml

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+name: Feature request
+about: Suggest an idea for this project
+label:
+  - Feature request
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this feature request! Please provide a short, but a descriptive title for your issue.
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the feature you'd like to see.
+      placeholder: |
+        As a user, I want to be able to...
+    validations:
+      required: true
+  - type: textarea
+    id: context
+    attributes:
+      label: Context and notes
+      description: Additional information about environment and what were you trying to do. If you have an idea how to implement this feature, please describe it here too.

.gitea/ISSUE_TEMPLATE/translation.yaml

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+name: Translation issue
+about: File a translation (localization) issue
+labels:
+  - Translations
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Translations can be modified and discussed on [Weblate](https://weblate.selfprivacy.org/projects/selfprivacy/). You can fix the mistranslation issue yourself there. Using the search, you can also find the string ID of the mistranslated string. If your issue is more complex, please file it here
+
+        If you are a member of SelfPrivacy core team, you **must** fix the issue yourself on Weblate.
+  - type: input
+    id: language
+    attributes:
+      label: Language
+      description: What language is affected?
+      placeholder: |
+        English
+    validations:
+      required: true
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+      description: Describe the issue in detail. If you have an idea how to fix this issue, please describe it here too. Include the string ID of the mistranslated string, if possible.
+      placeholder: |
+        The string `string.id` is translated as "foo", but it should be "bar".
+    validations:
+      required: true